Kerr, Norman S.
WM. C. Brown Co., 1967
Buku Teks
Kerr, Clark
Van Nostrand Teinhold, 1979
Buku Teks
Kerr, George H.
Charles E. Tuttle Company, 1960
Buku Teks
West, E.G., author
Airlington House, 1969
Buku Teks
Kerr, Donna H.
Westview Press, 1984
Buku Teks