what is the main source of vitamin c?
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Fruits and vegetables. The citrus fruits are usually availabe they ripen when the North is having winter when one needs vitamins the most so they are a good source.
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vitamin C and oranges
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amla is the indian gooseberry. I think it's got the highest vit c content among all the fruits and veggies. It's good for your hair and immunity. In india, you can buy something called called 'chywanprash', which is made of amla and is supposed to be super healthy.
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Scurvy - Vit C\nRickets - Vit D\netc.
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Calamansi is a good source of Vitamin C which is mainly from its juice, pulp, and peel (as it applies to most fruits and vegetables). It seeds may contain traces of vitamin C if it is fresh.♥
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A ... vitamin A,D,E & K are water soluble vitamins & A,C,E acts as antioxidants in the body
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You can start with with Wikipedia at the page referenced below.  As you would expect they have quite a bit on  cholecalciferol - Vitamin D3.   Cholecalciferol being the primary human vitamin in the above series.  I realize this is not a complete answer, but it will get you started.
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Actually Guava is known to have more vitamin C than even orange, contrary to what many people think!
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VITAMIN K \n\nVitamin K is necessary mainly for the coagulation of blood. It aids in forming prothrombin, an enzyme needed to produce fibrin for blood clotting. The richest sources of vitamin K are alfalfa and fish livers, which are used in making concentrated preparations of this vitamin. Dietary sources include all leafy green vegetables, egg yolks, soya bean oil, and liver. For a healthy adult, a normal diet and bacterial synthesis in the bowels usually are sufficient to supply the body with vitamin K and prothrombin. Digestive disturbances may lead to defective absorption of vitamin K and hence to mild disorders in blood clotting.
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vitamin A (If u r not taking green leafy vegetables, carrots,etc)\nVitamin B - take daily\nVitamin D (If u r not sufficiently exposed to  sun)\nVitamin C (if u r not consuming citrus foods regularly)\nvitamin E (for smooth and healthy  skin and hair)
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Garlic, echinacea and mega doses of Vitamin C.
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CHERRY - A rich source of calcium, vitamin C, anthocyamins, iron and potassium.
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i always thought that the main food groups were coffee and donuts  with nicotine as one of the minor ones [and what is wrong with smoking Ive been doing it for years and their is nothing wrong with my lung\nas for vitamin c that's healthy and should be baned!!!!!!!!
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One dietary chemical that the body can use as a vitamin A precursor is beta carotene, which comes from orange vegetables (carrots, orange squash).
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Milk has vitamin D & A, o.j. and apple juice has vitamin C.
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Vitamin c\nI think it was called\ngraduation (friends forever)
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Carbohydrates, Fats, Vitamins, Proteins, Minerals, Water