APA (7e ed.) Bronvermelding

Não informado. (1972). Ground water newsletter. Water Information Center.

Chicago (17e ed.) Bronvermelding

Não informado. Ground Water Newsletter. Washington: Water Information Center, 1972.

MLA (8e ed.) Bronvermelding

Não informado. Ground Water Newsletter. Water Information Center, 1972.

Let op: Deze citaties zijn niet altijd 100% accuraat.