Freedman, Amy L., author
Routledge, 2000
Buku Teks
Freedman, Amy L., author
Routledge, 2000
Buku Teks
Mann, Richard I., author
Gateway Books, 1994
Buku Teks
Rose, Peter I., foreword
Random House, 1964
Buku Teks
Rosinger, Lawrence K., author
Macmillan, 1950
Buku Teks