Rees, Martin
Basic Books , 1999
Buku Teks
Goldsmith, Donald, author
Perseus Books, 2000
Buku Teks
National Academy Press, 2001
Buku Teks
Pasachoff, Jay M., author
Thomson, 2001
Buku Teks
Arny, Thomas T., author
McGraw-Hill, Higher Education, 2004
Buku Teks