Kemm, John, author
Macmillan, 1995
Buku Teks
Carl I. Fertman, Diane D. Allensworth
Jossey-Bass , 2017
Buku Teks
Naidoo, Jennie, author
Baillere Tindall , 2000
Buku Teks
Pender, Nola J.
Appleton & Lange, 1996
Buku Teks
Pender, Nola J., author
Appleton & Lange, 1987
Buku Teks