Clyde, Paul H. (Paul Hibbert), author
Prentice-Hall, [date of publication not identified]
Buku Teks
Clyde, Paul Hibbert, author
Prentice-Hall, 1960
Buku Teks
Oxford University Press,
Majalah, Jurnal, Buletin
London : IP Publishing Ltd
Majalah, Jurnal, Buletin
Boeke, Hendrik Enno., author
Leiden Universitaire Pers 1948
Buku Teks