APA (7th ed.) Citation

Weems, P. V. H. (1940). Star altitude curves ([3d ed.). Weems system of navigation.

Chicago Style (17th ed.) Citation

Weems, Philip Van Horn. Star Altitude Curves. [3d ed. Annapolis, Md.: Weems system of navigation, 1940.

MLA (9th ed.) Citation

Weems, Philip Van Horn. Star Altitude Curves. [3d ed. Weems system of navigation, 1940.