APA (7e ed.) Bronvermelding

Não informado. (1935). Contributions from the Perkins Observatory. Ohio State University, Ohio Wesleyan University.

Chicago (17e ed.) Bronvermelding

Não informado. Contributions from the Perkins Observatory. Delaware, Ohio: Ohio State University, Ohio Wesleyan University, 1935.

MLA (8e ed.) Bronvermelding

Não informado. Contributions from the Perkins Observatory. Ohio State University, Ohio Wesleyan University, 1935.

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