Travers, John F.
Scott, Foresman, 1982
Buku Teks
Hurlock, Elizabeth Bergner, 1898-, author
McGraw-Hill Kogakusha, 1972
Buku Teks
Laybourn, Ann
Edinburgh HMSD , 1994
Buku Teks
Buzan, Tony, author
Gramedia Pustaka Utama , 2005
Buku Teks
Colin, Virginia L
McGraw-Hill , 1996
Buku Teks