APA Citation

Friedrich, W. 1., & Friedrich, W. 1. (1988). Vitamins. Berlin: Walter de Gruyter.

Chicago Style Citation

Friedrich, Wilhelm 1913-, and Wilhelm 1913- Friedrich. Vitamins. Berlin: Walter de Gruyter, 1988.

MLA Citation

Friedrich, Wilhelm 1913-, and Wilhelm 1913- Friedrich. Vitamins. Berlin: Walter de Gruyter, 1988.

Warning: These citations may not always be 100% accurate.