Robertson, Barry C.
John Wiley & Sons, 1981
Buku Teks
by James A. Richards ... [et.al.]
Addison-Wesley Publishing, 1960
Buku Teks
Ohanian, Hans C.
W.W. Norton , 1994
Buku Teks
Gautreau, Ronald
McGraw-Hill, 1978
Buku Teks
Peter Soedojo
Gadjah Mada Press, 1986
Buku Teks