Gould, W.T.S., author
John Wiley, Longman Scientific, 1993
Buku Teks
Payne, Geoffrey K., author
Leonard-Hill, 1977
Buku Teks
edited by Keith Watson
Croom Helm, 1982
Buku Teks
Valkenier, Elizabeth Kridl, author
Frederick A. Praeger, 1983
Buku Teks
Cambridge University Press, 2020
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