Cita APA (7th ed.)

Judson, S. (1987). Physical geology (7th ed.). Prentice-Hall.

Cita Chicago (17th ed.)

Judson, Sheldon. Physical Geology. 7th ed. Englewood Cliffs, N.J: Prentice-Hall, 1987.

Cita MLA (9th ed.)

Judson, Sheldon. Physical Geology. 7th ed. Prentice-Hall, 1987.