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