Ramsey
John Wiley & Sons, 1994
Buku Referensi
edited by Robert T. Packards
John Wiley & Sons, 1981
Buku Referensi
Hoke, John Ray, editor
John Wiley & Sons, 2000
Buku Referensi
Ramsey, Charles George, 1884-1963, author
John Wiley & Sons, 2000
Buku Teks
edited by Joseph N. Boaz
John Wiley & Sons, 1970
Buku Referensi