Phillips, Betty Lou
Gibbs Smith, 2000
Buku Teks
Marberry, Sara O., 1959-, author
Van Nonstrand Reinhold, 1994
Buku Teks
Cohen, Edie Lee, author
Cahners, 1984
Buku Teks
Hearst Books, 1996
Buku Teks
Madden, Chris Casson, author
Clarkson Potter, 1993
Buku Referensi