4148, 1999
Buku Teks
Janda, Kenneth, author
Houghton Miffiln, 1994
Buku Teks
Lindstrom, Eric
Swedish Institute, 1982
Buku Teks
Janda, Kenneth, author
Houghton Miffiln, 1987
Buku Teks
Villanueva, Buenaventure M
University of the Philippina, 1959
Buku Teks