Nel, L. T., Jacobs, H., Allan, J. T., & Bozzoli, G. R. (1937). "Wonderstone". Geological Survey Division.
Chicago Style (17th ed.) CitationNel, Louis T., H. Jacobs, J. T. Allan, and G. R. Bozzoli. "Wonderstone". [Pretoria]: Geological Survey Division, 1937.
MLA (9th ed.) CitationNel, Louis T., et al. "Wonderstone". Geological Survey Division, 1937.
Warning: These citations may not always be 100% accurate.