Heyel, C. (1967). The Foreman's Handbook. McGraw-Hill.
Cita Chicago (17th ed.)Heyel, Carl. The Foreman's Handbook. New York: McGraw-Hill, 1967.
Cita MLA (9th ed.)Heyel, Carl. The Foreman's Handbook. McGraw-Hill, 1967.
Atenció: Aquestes cites poden no estar 100% correctes.