Oliver, Douglas L.
Harvard University Press, 1951
Buku Teks
Oliver, Douglas L.
Harvard University Press, 1958.
Buku Teks
Campbell, I.C.
University of Queensland Press, 1989
Buku Teks
edited by Norman and Ngaire Douglas
Angus & Robertson, 1989
Buku Referensi
[Canberra] Angus & Robertson 1989,
Buku Referensi