Cita APA (7a ed.)

(1978). The World of learning.S: 1978-79. v.2 Rhodesia-Zambia (29th edition.). Europa.

Cita Chicago Style (17a ed.)

The World of Learning.S: 1978-79. V.2 Rhodesia-Zambia. 29th edition. London: Europa, 1978.

Cita MLA (8a ed.)

The World of Learning.S: 1978-79. V.2 Rhodesia-Zambia. 29th edition. Europa, 1978.