APA
Wilhelms F. T., Jelley H. m. & Wilhelms F. T. (1966). Consumer economics. New York: McGraw Hill.
Chicago
Wilhelms Fred T, Jelley HERBERT m and Wilhelms Fred T. 1966. Consumer economics. New York: McGraw Hill.
Harvard
Wilhelms F. T., Jelley H. m. and Wilhelms F. T. (1966). Consumer economics. New York: McGraw Hill.
MLA
Wilhelms Fred T, Jelley HERBERT m and Wilhelms Fred T. Consumer economics. New York: McGraw Hill. 1966.