Cita APA (7a ed.)

Watkins, W. J. H., & Watkins, H. S. L. (1966). How to look at geographical pictures (6. ed.). Macmillan.

Cita Chicago Style (17a ed.)

Watkins, William James Humphreys, y Howard Stanley Lloyd Watkins. How to Look at Geographical Pictures. 6. ed. London [u.a.]: Macmillan, 1966.

Cita MLA (9a ed.)

Watkins, William James Humphreys, y Howard Stanley Lloyd Watkins. How to Look at Geographical Pictures. 6. ed. Macmillan, 1966.