Bishop, A. C., Woolley, A. R., Hamilton, W. R., & Natural History Museum. (1999). Philip's mineralas, rocks and fossils. London : George Philip Ltd..

Bishop, A. C., A. R. Woolley, William Roger Hamilton, and Natural History Museum. Philip's Mineralas, Rocks and Fossils. London : George Philip Ltd., 1999.

Bishop, A. C., et al. Philip's Mineralas, Rocks and Fossils. London : George Philip Ltd., 1999.