Sumner, J. S. (1969). Geophysics,geologic structures and tectonics. WM C. Brown Pub.
Cita Chicago (17th ed.)Sumner, John Stewart. Geophysics,geologic Structures and Tectonics. Dubuque,Iowa: WM C. Brown Pub, 1969.
Cita MLA (9th ed.)Sumner, John Stewart. Geophysics,geologic Structures and Tectonics. WM C. Brown Pub, 1969.
Atenció: Aquestes cites poden no estar 100% correctes.