Bettycopa, A. (2015). Diversity and feeding guilds of understorey bird in an oil palm plantation and adjacent Peat Swamp forest in Betong Division, Sarawak, Malaysia.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Bettycopa, Amit. Diversity and Feeding Guilds of Understorey Bird in an Oil Palm Plantation and Adjacent Peat Swamp Forest in Betong Division, Sarawak, Malaysia. 2015.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Bettycopa, Amit. Diversity and Feeding Guilds of Understorey Bird in an Oil Palm Plantation and Adjacent Peat Swamp Forest in Betong Division, Sarawak, Malaysia. 2015.
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