(2018). A pioneer's golden anniversary: : Sarawak Oil Palms Berhad 50th anniversary 1968-2018. Sarawak Oil Palms Berhad.
Lua i Stíl Chicago (17ú heag.)A Pioneer's Golden Anniversary: : Sarawak Oil Palms Berhad 50th Anniversary 1968-2018. Miri, Sarawak: Sarawak Oil Palms Berhad, 2018.
Lua MLA (8ú heag.)A Pioneer's Golden Anniversary: : Sarawak Oil Palms Berhad 50th Anniversary 1968-2018. Sarawak Oil Palms Berhad, 2018.
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