Ward, C.H.S
The Epworth Press, 1934
Buku Teks
Deussen, Paul, 1845-1919
The Grafton press, 1927
Buku Teks
Saunders, E. Dale, author
University of Pennsylvania, 1964
Buku Teks
Austin, James C.
Twayne , [1964]
Buku Teks
Humphreys, Christmas, author
Penguin Books, 1985
Buku Referensi