Παραπομπή APA

Blewitt, M. (1971). Celestial navigation for yachtsmen (5th ed.). Edward.

Παραπομπή Chicago Style

Blewitt, Mary. Celestial Navigation for Yachtsmen. 5th ed. London: Edward, 1971.

Παραπομπή MLA

Blewitt, Mary. Celestial Navigation for Yachtsmen. 5th ed. Edward, 1971.