1. COSCO Pacific Ltd., Annual report (1996–1999)
2. HIT's web page, http://www.hph.com.hk/hit/index2.asp
3. Hong Kong port statistics (quarterly report) starting from 1st quarter of 99 to 4th quarter of 99, Hong Kong Marine Department
4. Hutchison Whampoa Limited, Annual report (1996–1999)
5. L. Kleinrock, Queueing Systems, vol. 1: Theory, Wiley, New York, 1975, p. 124