Helmberger, Peter G., author
McGraw-Hill, 1991
Buku Teks
Gilbert, Neil, author
Prentice-Hall, 1986
Buku Teks
Gilbert, Neil, author
Allyn and Bacon, 1998
Buku Teks
Gilbert, Neil, author
Prentice-Hall, 1974
Buku Teks
edited by Werner Sichel
Ann Arbor, 1970
Buku Teks