Egbert, Lawrence Deems
Oceana, 1979
Buku Referensi
general editors, Clive Parry, John P. Grant, Anthony Parry, Arthur D. Watts
Oceana Publications, 1988
Buku Referensi
Ross, Martin J., author
Prentice-Hall, 1977
Buku Teks
London: Tiger Books International, 1994,
Buku Referensi
Drake, St. Clair
Harper and Row, 1962
Buku Teks