1. Ahmad, F., Pan-Ind. Ocean Sci. Cong., Perth (Abstracts) (1954).
2. Du Toit, A. L., Our Wandering Continents (Oliver and Boyd, 1957).
3. Irving, E., Palaeomagnetism, 399 (John Wiley, 1964).
4. Runcorn, S. K., Quart. J. Geol. Soc., Lond., 120, 34 (1964).
5. Creer, K. M., Discovery (1965).