edited by James Flood, Shirley Brice Heath, and Diane Lapp
MacMillan Library Reference USA, 1996
Buku Referensi
Mann, Steve, 1960-
Routledge, 2017
Buku Teks
Ron White...[et al.]
Cambridge University Press , 1991
Buku Teks SO
edited by Merlin C. Wittrock; a project of the American Educational Research Association
Macmillan Library Reference USA, 1986
Buku Referensi
Jesus Romero-Trillo, editor
Springer, 2012
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