Isaacs, Neil S., author
John Wiley & Sons, 1981
Buku Teks
Entelis, S.G., author
John Wiley & Sons, 1976
Buku Teks
Popovych, Orest, author
John Wiley & Sons, 1981
Buku Teks
Blom, Leendert
Joh Luuk, [date of publication not identified]
Buku Teks
Beiser, Arthur, author
McGraw-Hill, 1964
Buku Teks