APA aipamena

Wolff, H. (1989). Philippine directory of occupational health and safety. Edith T. Flores & Hans-Juergen Wolff.

Chicago Style aipamena

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

MLA aipamena

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