1. Chee H. L. Health and Health Care in Malaysia: Present Trends and Implications for the Future, p. 58. Institut Pengajian Tinggi, Universiti Malaya, Kuala Lumpur, 1990.
2. Malaysia. The Second Outline Perspective Plan 1991–2000, p. 150. National Printing Department, Kuala Lumpur, 1991.
3. Malaysia. Kajian Separuh Penggal Rancangan Malaysia Keenam 1991–1995, p. 265. Percetakan Nasional Malaysia, Kuala Lumpur, 1993.
4. Ahmad Sarji Abdul Hamid (ed.). Malaysia's Vision 2020: Understanding the Concept, Implications and Challenges, p. 405. Pelanduk Publications, Petaling Jaya, 1993.