Παραπομπή APA

Heyel, C. (1955). Foreman's handbook/3e (3rd ed.). Mc graw hill book company.

Παραπομπή Chicago Style

Heyel, Carl. Foreman's Handbook/3e. 3rd ed. New York: Mc graw hill book company, 1955.

Παραπομπή MLA

Heyel, Carl. Foreman's Handbook/3e. 3rd ed. Mc graw hill book company, 1955.