Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

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