James, Ann
Longman, 1998
Buku Teks
Germann, A.C., author
C.C. Thomas, 1971
Buku Teks
Souryal, Sam S., 1930-, author
Elsevier, 2011
Buku Teks
Davies, Malcom, author
Longman, 1995
Buku Teks
Roberson, Cliff, author
CRC Press, Taylor & Francis Group, 2008
Buku Teks