APA (7e ed.) Bronvermelding

Não informado. (1971). NLL Announcement Bulletin. National Lending Library for Science and Technology.

Chicago (17e ed.) Bronvermelding

Não informado. NLL Announcement Bulletin. Boston, Inglaterra: National Lending Library for Science and Technology, 1971.

MLA (8e ed.) Bronvermelding

Não informado. NLL Announcement Bulletin. National Lending Library for Science and Technology, 1971.

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