Cotter, C. H. (1966). The astronomical and mathematical foundations of geography. Hollis & Carter.
Chicago-viite (17. p.)Cotter, Charles H. The Astronomical and Mathematical Foundations of Geography. London: Hollis & Carter, 1966.
MLA-viite (9. p.)Cotter, Charles H. The Astronomical and Mathematical Foundations of Geography. Hollis & Carter, 1966.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.