Stair, Ralph M., Jr., author
Dow Jones-Irwin , 1983
Buku Teks
Cantor, Nathaniel, author
Harper & Brothers, 1958
Buku Teks
Makarenko, A.S., author
Moscow Foreign Languages Publishing House 1953
Buku Teks
edited by Maxine Melling
Facet Publishing, 2005
Buku Teks
Wheatley, Margareta, author
Berrett-Koehler, 2011
Buku Teks