Ooi 2004, p. 138–139. Ooi, Keat Gin (2004). Southeast Asia: A Historical Encyclopedia, from Angkor Wat to East Timor: A Historical Encyclopedia, from Angkor Wat to Timor, Volume 1. ABC-CLIO. ISBN978-1-57607-770-2.
Ooi 2004, p. 819. Ooi, Keat Gin (2004). Southeast Asia: A Historical Encyclopedia, from Angkor Wat to East Timor: A Historical Encyclopedia, from Angkor Wat to Timor, Volume 1. ABC-CLIO. ISBN978-1-57607-770-2.
Ooi 2004, p. 114. Ooi, Keat Gin (2004). Southeast Asia: A Historical Encyclopedia, from Angkor Wat to East Timor: A Historical Encyclopedia, from Angkor Wat to Timor, Volume 1. ABC-CLIO. ISBN978-1-57607-770-2.
Gayl D. Ness (May 1972). "May 13: Before and After. by Tunku Abdul Rahman; Malaysia: Death of a Democracy. by John Slimming; The May 13 Tragedy: A Report. by The National Operations Council; The May Thirteenth Incident and Democracy in Malaysia. by Goh Cheng Tiek". The Journal of Asian Studies. 31 (3): 734–736. doi:10.1017/s0021911800137969. JSTOR2052316.
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Ranjit Gill (1990). Of Political Bondage(PDF). Singapore: Sterling Corporate Services. pp. 78–80. ISBN981-00-2136-4. Archived(PDF) from the original on 4 September 2022. Retrieved 5 September 2022.
Gayl D. Ness (May 1972). "May 13: Before and After. by Tunku Abdul Rahman; Malaysia: Death of a Democracy. by John Slimming; The May 13 Tragedy: A Report. by The National Operations Council; The May Thirteenth Incident and Democracy in Malaysia. by Goh Cheng Tiek". The Journal of Asian Studies. 31 (3): 734–736. doi:10.1017/s0021911800137969. JSTOR2052316.
Ranjit Gill (1990). Of Political Bondage(PDF). Singapore: Sterling Corporate Services. pp. 78–80. ISBN981-00-2136-4. Archived(PDF) from the original on 4 September 2022. Retrieved 5 September 2022.