Gillett, Billy E.
Tata McGraw-Hill , 1994
Buku Teks
Gupta
S.CHAND & COMPANY LTD., 1979
Buku Teks
Stoller, David S.
University of California Press, 1964
Buku Teks
Pangestu Subagyo
BPFE-UGM, 1989
Buku Teks
Ravindran, A.
John Wiley & Sons, 1987
Buku Teks