APA استشهاد

Barlow, C. W. C. (1892). Mathematical astronomy. University correspondence college.

استشهاد بنمط شيكاغو

Barlow, Crossley William Crosby. Mathematical Astronomy. London: University correspondence college, 1892.

MLA استشهاد

Barlow, Crossley William Crosby. Mathematical Astronomy. University correspondence college, 1892.