Wright, Philip G.
The University of Chicago Press, 1931
Buku Teks
Gupta, K.R.
S. Chand, 1967
Buku Teks
Crosby, Philip B.
McGraw-Hill, 1979
Buku Teks
edited by Leslie V. Castle, Christopher Findlay
Allen & Unwin, 1988
Buku Referensi
Gill, Philip E.
Academic Press , 1981
Buku Teks