APA (7th ed.) Citation

Jackson, N., & Penn, P. (1980). A Groundwork of physical geography. George Philip.

Chicago Style (17th ed.) Citation

Jackson, Nora, and Philip Penn. A Groundwork of Physical Geography. London: George Philip, 1980.

MLA (9th ed.) Citation

Jackson, Nora, and Philip Penn. A Groundwork of Physical Geography. George Philip, 1980.

Warning: These citations may not always be 100% accurate.