Geldard, Kathyrn, author
Sage, 2002
Buku Teks
edited by Wolfgang Schneider, Ruth Hengsteler, B. Sodian
Lawrence Erlbaum Assossiates, 2004
Buku Teks
Furu, Takeo, author
Sophia University, 1971
Buku Teks
Sullivan, Michael, author
American Library association, 2005
eBooks
Sullivan, Michael, author
American Library Association, 2005
eBooks