Quelsch, John A.
Prentice-Hall, 1989
Buku Teks
Smykey, Edward W., author
Macmillan, 1961
Buku Teks
Sethna, Beheruz N.
Tata McGraw-Hill, 1984
Buku Teks
Terry, George Robert, author
Prentice-Hall, 1957
Buku Teks
Howard, John A., author
Richard D. Irwin, 1962
Buku Teks