Block, Stanley B.
Richard D. Irwin, 1987
Buku Teks
Block, Stanley B.
Irwin, 1994
Buku Teks
Higgins, Robert C.
McGraw-Hill, 2000
Buku Teks
Walker, Ernest W.
Harper & Brothers, 1961
Buku Teks
by David F. Scott ... [and others]
Prentice Hall International, 1999
Buku Teks