Stamp, Patricia
International Development Research Centre, 1989
Buku Teks
Murphy, Patricia Watkins, author
Sage Publications, 2003
Buku Teks
Institute of Southeast Asian Studies, 1984
Buku Referensi
Collin, C.H,
Butterworth-Heinemann, 1995
Buku Teks
Miller, Patricia H., author
W.H. Freeman and Company, 1983
Buku Teks