Walker, Orville C.
McGraw-Hill, 2006
Buku Teks
Grimshaw, Austin
McGraw-Hill, 1960
Buku Teks
Boyd Jr., Harper W.
Richard D. Irwin Inc , 1958
Buku Teks
Keast, William R., editor
Jossey-Bass Publishers, 1973
Buku Teks
Charvat, Frank J.
Heath, 1966
Buku Teks