Fort Church Publishers, Inc., 1985
Buku Teks
Schroeder, John Frederick
The Mount Vernon Ladies Association, 1947
Buku Teks
Weeks, Christopher
Johns Hopkins University Press, 1994
Buku Referensi
Pelz, Ruth.
Murray Pub. Co, 1979
Buku Teks
Stevenson, Augusta
Bobbs-Merrill, 1959
Buku Teks