Richard V.Clemence
W.W. Norton and Company,Inc., 1953
Buku Teks
Hansen, Alvin Harvey, 1887-1975, author
W.W. Norton, 1951
Buku Teks
Hansen, Alvin Harvey, 1887-1975, author
W.W. Norton, 1951
Buku Teks
edited by Warren L. Smith and Ronald L. Teigen
Ill R. D. Irwin , 1970
Buku Teks
Hamberg, Daniel, author
Macmillan, 1951
Buku Teks