Citazione APA

Slijper, E. J. (1919). Whales / 2nd ed (2nd ed.). Hutchinson.

Stile di citazione Chicago

Slijper, E J. Whales / 2nd Ed. 2nd ed. London: Hutchinson, 1919.

Citazione MLA

Slijper, E J. Whales / 2nd Ed. 2nd ed. Hutchinson, 1919.