Robinson, Kate
Butterworth-Heinemann, 1998
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
Lindeman, Carol A.
W.B. Saunders, 1999
Buku Teks