Geological Survey (South Africa), Geological Survey (South Africa), South Africa. Department of Mines, Council for Geoscience (South Africa), & South Africa. Department of Mineral and Energy Affairs. (1972). Seismologic series. Government Printer.
Chicago-viite (17. p.)Geological Survey (South Africa), Geological Survey (South Africa), South Africa. Department of Mines, Council for Geoscience (South Africa), ja South Africa. Department of Mineral and Energy Affairs. Seismologic Series. Pretoria: Government Printer, 1972.
MLA-viite (8. p.)Geological Survey (South Africa), et al. Seismologic Series. Government Printer, 1972.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.