Natural History Press, 1971
Buku Teks
Pfeiffer, John E., author
McGraw-Hill , 1977
Buku Teks
Childe, Gordon, author
Penguin Books , [1946]
Buku Teks
Constable, George, author
Time-Life Books, 1973
Buku Teks
Childe, Gordon, author
Penguin Books, 1958
Buku Teks