Higgins, Benjamin
D. Van Nostrand, 1963
Buku Teks
Higgins, Benjamin
Richard D. Irwin, 1962
Buku Teks
Higgins, Raymond.A.
E. Arnold,, 1980
Buku Teks
Walsh, Henry H.
The Stephen Press, 1969
Buku Teks
Penning, W.L.
S.L. Van Looy, [Date of publication not identified]
Buku Teks