APA (7th ed.) Citation

Craig, G. Y. (1991). Geology of Scotland (3. ed.). Geological Society.

Chicago Style (17th ed.) Citation

Craig, Gordon Y. Geology of Scotland. 3. ed. London: Geological Society, 1991.

MLA (9th ed.) Citation

Craig, Gordon Y. Geology of Scotland. 3. ed. Geological Society, 1991.