Παραπομπή σε μορφή APA (7η εκδ.)

Sayer, R. A. (1991). Radical geography and the crisis of Marxist political economy. Centre for Urban and Regional Research, University of Sussex.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Sayer, R. Andrew. Radical Geography and the Crisis of Marxist Political Economy. Brighton: Centre for Urban and Regional Research, University of Sussex, 1991.

Παραπομπή σε μορφή MLA (9th εκδ.)

Sayer, R. Andrew. Radical Geography and the Crisis of Marxist Political Economy. Centre for Urban and Regional Research, University of Sussex, 1991.