Cita APA (7a ed.)

Wolff, H. (1989). Philippine directory of occupational health and safety. Edith T. Flores and H.J. Wolff.

Cita Chicago Style (17a ed.)

Wolff, Hans-Juergen. Philippine Directory of Occupational Health and Safety. Manila: Edith T. Flores and H.J. Wolff, 1989.

Cita MLA (9a ed.)

Wolff, Hans-Juergen. Philippine Directory of Occupational Health and Safety. Edith T. Flores and H.J. Wolff, 1989.