Cita APA (7th ed.)

Beckinsale, R. P. (1966). Land, air and ocean (4a. ed.). Gerald Duckworth.

Cita Chicago (17th ed.)

Beckinsale, R. P. Land, Air and Ocean. 4a. ed. Londres: Gerald Duckworth, 1966.

Cita MLA (9th ed.)

Beckinsale, R. P. Land, Air and Ocean. 4a. ed. Gerald Duckworth, 1966.