Cita APA

Crumley, C., & Hornborg, A. (2009). The World system and the Earth system.

Chicago Edition Citation

Crumley, Carole, i Alf Hornborg. The World System and the Earth System. NewDelhi, P H I, 2009.

Cita MLA

Crumley, Carole, i Alf Hornborg. The World System and the Earth System. 2009.