Numrich, Carol
Longman, 1994
Buku Teks
Alfaro-LeFevre, Rosalinda, author
Elsevier Saunders , 2004
Buku Teks
Kubasek, Nancy K., author
Pearson, 2015
Buku Teks
Alfaro-LeFevre, Rosalinda, author
Saunders Elsevier, 2009
Buku Teks
Ticehurst, George William, author
Longman, 2000
Buku Teks