Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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