APA (7th ed.) Citation

Lock, W. W., Andrews, J. T., & Webber, P. J. (1979). A manual for lichenometry. British Geomorphological Research Group.

Chicago Style (17th ed.) Citation

Lock, W. W., J. T. Andrews, and P. J. Webber. A Manual for Lichenometry. London: British Geomorphological Research Group, 1979.

MLA (9th ed.) Citation

Lock, W. W., et al. A Manual for Lichenometry. British Geomorphological Research Group, 1979.