APA استشهاد

Pickering, W. H. (1908). Researches of the Boyden Department. Annals of the astronomical observatory of Harvard College 61,1.

استشهاد بنمط شيكاغو

Pickering, William Henry. "Researches of the Boyden Department." Annals of the Astronomical Observatory of Harvard College 61,1 1908.

MLA استشهاد

Pickering, William Henry. "Researches of the Boyden Department." Annals of the Astronomical Observatory of Harvard College 61,1 1908.