APA (7th ed.) Citation

(1991). Coal: Formation, occurrence and related properties ; Orleans, 12 - 15 septembre 1989.

Chicago Style (17th ed.) Citation

Coal: Formation, Occurrence and Related Properties ; Orleans, 12 - 15 Septembre 1989. Paris, 1991.

MLA (9th ed.) Citation

Coal: Formation, Occurrence and Related Properties ; Orleans, 12 - 15 Septembre 1989. 1991.

Warning: These citations may not always be 100% accurate.