Cita APA (7a ed.)

Clarke, C., & Clarke, S. (2018). Human environments (National 4 & 5, second edition.). Hodder Gibson.

Cita Chicago Style (17a ed.)

Clarke, Calvin, y Susie Clarke. Human Environments. National 4 & 5, second edition. Glasgow: Hodder Gibson, 2018.

Cita MLA (9a ed.)

Clarke, Calvin, y Susie Clarke. Human Environments. National 4 & 5, second edition. Hodder Gibson, 2018.