Citazione Stile APA (7a Edizione)

Purton, R. W. (1961). Our heritage (3. impression.). Collins Clear-Type Press.

Citazione stile Chigago Style (17a edizione)

Purton, Rowland W. Our Heritage. 3. impression. London: Collins Clear-Type Press, 1961.

Citatione MLA (9a ed.)

Purton, Rowland W. Our Heritage. 3. impression. Collins Clear-Type Press, 1961.