APA (7th ed.) Citation

Kropf, W., & Houben, M. (1980). Harmful food additives-- the eat safe guide. Ashley Books.

Chicago Style (17th ed.) Citation

Kropf, William, and Milton Houben. Harmful Food Additives-- the Eat Safe Guide. Port Washington, N.Y.: Ashley Books, 1980.

MLA (9th ed.) Citation

Kropf, William, and Milton Houben. Harmful Food Additives-- the Eat Safe Guide. Ashley Books, 1980.