Frederickson, H. George, author
LP3ES, 1983
Buku Teks
Rosenthal, A.M., author
McGraw-Hill, 1964
Buku Teks
Boelaars, J.H.M.C.
EJ Brill, 1950
Buku Teks
Kedgley, Sue
Penguin Books, 1989
Buku Teks
Woolford, Donald Mark, author
University of Queensland Press, 1976
Buku Teks