Simpson, D. 1940. A summary of seismic prospecting in South Africa with gravimetric and magnetometric confirmatory evidence. University of Cape Town.

Simpson, D. J. (1940). A summary of seismic prospecting in South Africa with gravimetric and magnetometric confirmatory evidence. (Thesis). University of Cape Town ,Faculty of Science ,Department of Geological Sciences. Retrieved from http://hdl.handle.net/11427/23525

Simpson, Douglas James. "A summary of seismic prospecting in South Africa with gravimetric and magnetometric confirmatory evidence." Thesis., University of Cape Town ,Faculty of Science ,Department of Geological Sciences, 1940. http://hdl.handle.net/11427/23525

Simpson DJ. A summary of seismic prospecting in South Africa with gravimetric and magnetometric confirmatory evidence. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Geological Sciences, 1940 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/23525