1. Extent and nature of yaws in Africa;Hackett;Bulletin of the World Health Organization,1953
2. Transmission of yaws in nature;Hackett;Journal of Tropical Medicine and Hygiene,1957
3. Assessment Report on Treponematoses Control Indonesia;Hackett;(WHO Project Indonesia 0001). WHO Document SEA/YDT/12 Rev 1,1969
4. Yaws eradication in Indonesia. Dr. Kodijat's contribution;Hackett;Transactions of the Royal Society of Tropical Medicine and Hygiene,1970