Boeking, Joseph
New York, N.Y. New York Duell, Sloan and Pearce 1943,
Buku Teks
Arnold, Thurman Wesley, author
New Haven Yale University Press 1937,
Buku Teks
Crow, Carl, author
Tudorr Publishing, 1937
Buku Teks
Departemen Kesehatan, 1992
Buku Teks
Longford, Joseph H.
T. Fisher,, 1911
Buku Teks