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Yap T.H., . The intelligent management of lepidoptera leaf eaters in mature oil palm by trunk injection (a review of principles). pp. 99-10. ISSN 0126-575X
Julius I., . and Choong C.T., . and Yap T.H., . and Ng K.Y., . (1990) Beta-cyfluthrin a synithetic i.e. synthetic pyrethroid insecticide for the control of lepidopterous pests. [Proceedings Paper]
Ng K.Y., . and Yap T.H., . (1990) The effects of triadimefon and triadimenol in controlling white root disease of rubber. [Proceedings Paper]
Yap T.H., . and Ng K.Y., . (1986) Influence of pesticides on the incidence of virus disease and leaf curl symptoms in chilli (Capsicum annuum) in Malaysia. In: 2. International Conference on Plant Protection in the Tropics, 17-20 Mar 1986, Genting Highlands (Malaysia).
