Harman, Harry H.
The University of Chicago Press, 1976
Buku Teks
Whittaker, E.T.
Cambridge University Press, 1965
Buku Teks
Edwards, Allen L.
Rinehart and Winston , 1958
Buku Teks
Stanford Univ. Press ., 1961
Buku Teks
Lewis, Edward E.
Houghton Mifflin , 1963
Buku Teks