Hogbin, Herbert Ian, author
Routledge and Kegan Paul, 1951
Buku Teks
Australia : University of Sydney
Majalah, Jurnal, Buletin
Boelaars, J.H.M.C.
EJ Brill, 1950
Buku Teks
Robson, R.W., author
Pacific Publications PTY, 1954
Buku Teks
Mytinger, Caroline
Macmillan, 1946
Buku Teks