Παραπομπή APA

Kawatra, S. K., & Kawatra, S. K. (1995). High efficiency coal preparation: An international symposium. Little, Colo.: Society for Mining, Metallurgy, and Exploration.

Παραπομπή Chicago Style

Kawatra, S. K., and S. K. Kawatra. High Efficiency Coal Preparation: An International Symposium. Little, Colo.: Society for Mining, Metallurgy, and Exploration, 1995.

Παραπομπή MLA

Kawatra, S. K., and S. K. Kawatra. High Efficiency Coal Preparation: An International Symposium. Little, Colo.: Society for Mining, Metallurgy, and Exploration, 1995.

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