Cita APA (7a ed.)

World Coal Study., Greene, R. P., Gallagher, J. M., & Wilson, C. L. (1980). Future coal prospects: Country and regional assessments. Ballinger.

Cita Chicago Style (17a ed.)

World Coal Study., Robert P. Greene, J. Michael Gallagher, y Carroll L. Wilson. Future Coal Prospects: Country and Regional Assessments. Cambridge (Massachusetts): Ballinger, 1980.

Cita MLA (9a ed.)

World Coal Study., et al. Future Coal Prospects: Country and Regional Assessments. Ballinger, 1980.