Rivers, W. H. R. (William Halse Rivers), 1864-1922, author
The Athlone Press, 1968
Buku Teks
Forde, C. Daryll
Metheun & Co. , 1963
Buku Teks
Du Bois, Cora Alice, 1903-1991, author
The University of Minnesota Press, 1944
Buku Teks
Garn, Stanley M.
Charles C. Thomas, 1971
Buku Teks
Hoebel, E. Adamson, author
McGraw-Hill, 1958
Buku Teks