Cita APA (7th ed.)

Edited by Estall, R. (1991). Global change and challenge: Geography for the 1990s. Routledge.

Cita Chicago (17th ed.)

Edited by Estall, Robert. Global Change and Challenge: Geography for the 1990s. London: Routledge, 1991.

Cita MLA (9th ed.)

Edited by Estall, Robert. Global Change and Challenge: Geography for the 1990s. Routledge, 1991.