Pham และผู้แต่งคนอื่นๆ. 1996. Immunization against ascariasis : an experimental study in Hanoi Medical School. Department of Health Development, Chulalongkorn University;
Pham และผู้แต่งคนอื่นๆ. (1996) Immunization against ascariasis : an experimental study in Hanoi Medical School . Chulalongkorn University/Bangkok.
Pham และผู้แต่งคนอื่นๆ. Immunization against ascariasis : an experimental study in Hanoi Medical School. . Bangkok:Chulalongkorn University, 1996.
Pham และผู้แต่งคนอื่นๆ. (1996) Immunization against ascariasis : an experimental study in Hanoi Medical School . Chulalongkorn University/Bangkok.