APA (7th ed.) Citation

Smith, P. (1989). Once a coal miner: The story of Colorado's northern coal field. Pruett.

Chicago Style (17th ed.) Citation

Smith, Phyllis. Once a Coal Miner: The Story of Colorado's Northern Coal Field. Boulder, Colo.: Pruett, 1989.

MLA (9th ed.) Citation

Smith, Phyllis. Once a Coal Miner: The Story of Colorado's Northern Coal Field. Pruett, 1989.