Deetz, James.
Natural History Press for the American Museum of Natural Histor, 1967
Buku Teks
Forbes, Bryan
Collins , 1986
Buku Teks
Marden, Charles Frederick.
American Book Co, 1968
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Norman, Philip
Corgi Books,, 1983
Buku Teks
Crosby, Norman
Nicholson & Watson, 1948
Buku Teks