Fleming, C.M.
Routledge and Kegan Paul, 1955
Buku Teks
Garrison, Karl C.
Prentice-Hall, 1975
Buku Teks
Cole, Luella
Holt, Rinehart and Winston, 1963
Buku Teks
Santrock, John W.
McGraw-Hill Education, 2019
Buku Teks
Santrock, John W.
McGraw-Hil , 2005
Buku Teks