APA (7e ed.) Bronvermelding

Não informado. (1987). Marketing library services. Learned Information.

Chicago (17e ed.) Bronvermelding

Não informado. Marketing Library Services. Medford, NJ: Learned Information, 1987.

MLA (8e ed.) Bronvermelding

Não informado. Marketing Library Services. Learned Information, 1987.

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