Leavitt, Maribelle Bryde
Maribella Bryde Leavitt 1, 1982
Buku Teks
McMurray, Anne
Churchill Livingstone , 1990
Buku Teks
Campbell, Claire
Delmar , 1984
Buku Teks
Campbell, Claire
John Wiley & Sons, 1978
Buku Referensi
Lindeman, Carol A.
WB Sounders company , 1999
Buku Teks