APA (7th ed.) Citation

Thomas, J. A. G. (1977). An introduction to geological maps (2nd ed.). Murby : Allen and Unwin.

Chicago Style (17th ed.) Citation

Thomas, J. A. G. An Introduction to Geological Maps. 2nd ed. London: Murby : Allen and Unwin, 1977.

MLA (8th ed.) Citation

Thomas, J. A. G. An Introduction to Geological Maps. 2nd ed. Murby : Allen and Unwin, 1977.