Playford, P. E., & Playford, P. E. (1970). Geraldton, [Western Australia]: Sheet SH/50-1 international index. Bureau of Mineral Resources, Geology and Geophysics.
Cita Chicago (17th ed.)Playford, Phillip E., i Phillip E. Playford. Geraldton, [Western Australia]: Sheet SH/50-1 International Index. [Canberra, A.C.T.]: Bureau of Mineral Resources, Geology and Geophysics, 1970.
Cita MLA (8th ed.)Playford, Phillip E., i Phillip E. Playford. Geraldton, [Western Australia]: Sheet SH/50-1 International Index. Bureau of Mineral Resources, Geology and Geophysics, 1970.
Atenció: Aquestes cites poden no estar 100% correctes.