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A Dell Book, 1960
Buku Teks
edited by Mark Collins ; foreword by David Attenborough
Oxford University Press, 1990
Buku Teks
Whitmore, T.C.
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Buku Teks
Veevers-Carter, W.
Oxford University Press , 1984
Buku Teks
Restu Sulistyorini
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2013
UI - Skripsi (Membership)