APA (7e ed.) Bronvermelding

Okun, D. A., & Ponghis, G. (1975). Community wastewater collection and disposal. World Health Organization ; sold by the Q. Corp.].

Chicago (17e ed.) Bronvermelding

Okun, Daniel Alexander, en George Ponghis. Community Wastewater Collection and Disposal. Geneva : [Albany, N.Y.: World Health Organization ; sold by the Q. Corp.], 1975.

MLA (8e ed.) Bronvermelding

Okun, Daniel Alexander, en George Ponghis. Community Wastewater Collection and Disposal. World Health Organization ; sold by the Q. Corp.], 1975.