Cita APA (7th ed.)

KELLER J J. (2001). SAFETY MANAGER'S HANDBOOK. J.J KELLER & ASOCIATES , INC.

Cita Chicago (17th ed.)

KELLER J J. SAFETY MANAGER'S HANDBOOK. WISCONSIN: J.J KELLER & ASOCIATES , INC, 2001.

Cita MLA (9th ed.)

KELLER J J. SAFETY MANAGER'S HANDBOOK. J.J KELLER & ASOCIATES , INC, 2001.