De Mare, George
John Wiley , 1979
Buku Teks
Phillips, Gerald M., author
Macmillan, 1982
Buku Teks
Hanna, Michael S., 1939-, author
McGraw-Hill, 1991
Buku Teks
Berko, Roy M, author
Houghton Miffiln, 2001
Buku Teks
Hamilton, Cheryl, author
Thomson/Wadsworth, 2011
Buku Teks