Παραπομπή APA

Wills, B., & Barley, R. (1986). Mineral processing at a crossroads: Problems and prospects. Dordrecht: Martinus Nijhoff Publishers.

Παραπομπή Chicago Style

Wills, B.A., and R.W Barley. Mineral Processing At a Crossroads: Problems and Prospects. Dordrecht: Martinus Nijhoff Publishers, 1986.

Παραπομπή MLA

Wills, B.A., and R.W Barley. Mineral Processing At a Crossroads: Problems and Prospects. Dordrecht: Martinus Nijhoff Publishers, 1986.

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