Penning, W.L.
S.L. Van Looy, 1920
Buku Teks
Doren, Carl van
World Publishing, 1948
Buku Teks
Walsh, Henry H.
The Stephen Press, 1969
Buku Teks
Lewin, Benjamin
John Wiley & Sons, 1983
Buku Teks
edited by Gordon S. Haight
Walter J. Black, 1941
Buku Teks