Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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