APA (7th ed.) Citation

Soper, J., Wilson, K., & Crew, P. (1971). The Black Cliff : the history of rock climbing on Clogwyn du'r Arddu: The history of rock climbing on Clogwyn du'r Arddu. Kaye and Ward.

Chicago Style (17th ed.) Citation

Soper, Jack, Ken Wilson, and Peter Crew. The Black Cliff : The History of Rock Climbing on Clogwyn Du'r Arddu: The History of Rock Climbing on Clogwyn Du'r Arddu. London: Kaye and Ward, 1971.

MLA (9th ed.) Citation

Soper, Jack, et al. The Black Cliff : The History of Rock Climbing on Clogwyn Du'r Arddu: The History of Rock Climbing on Clogwyn Du'r Arddu. Kaye and Ward, 1971.

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