Citazione Stile APA (7a Edizione)

Watkins, W. J. H., & Watkins, H. S. L. (1965). How to look at geographical pictures (5. ed.). Macmillan.

Citazione stile Chigago Style (17a edizione)

Watkins, William James Humphreys, e Howard Stanley Lloyd Watkins. How to Look at Geographical Pictures. 5. ed. London [u.a.]: Macmillan, 1965.

Citatione MLA (9a ed.)

Watkins, William James Humphreys, e Howard Stanley Lloyd Watkins. How to Look at Geographical Pictures. 5. ed. Macmillan, 1965.