Roojen, Pepin van, compiler
Thw Pepin Press, 2010
Buku Teks
Rockport Publishers, INC, 1995
Buku Teks
Wellons, Blanche
Laidlaw, 1949
Buku Teks
Higgins, James E., author
Teachers College Press, 1971
Buku Teks
editor, Karli Verghese, Helen Lewis, Leanne Fitzpatrick
Springer, 2012
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