Gaya APA

Walcher, D, N., Kretchmer, N. (1981). Food, nutrition and evolution : food as an environmental factor in the genesis of human variability . New York: Masson Pub. USA..

Gaya MLA

Walcher, Dwain, N.., Kretchmer, Norman. "Food, nutrition and evolution : food as an environmental factor in the genesis of human variability". New York: Masson Pub. USA., 1981. Text.