Hogbin, Herbert Ian, author
Routledge and Kegan Paul, 1951
Buku Teks
Williams, Maslyn, author
Cheshire, 1970
Buku Teks
van der Veur, Paul W., author
Australian National University Press, 1966
Buku Teks
Mair, L. P.
Christophers, 1948
Buku Teks
Boelaars, J.H.M.C.
EJ Brill, 1950
Buku Teks