Sermsakul Pojanagaroon และ Chaweang Kaewrak. (2004) Flowering of Olive (Olea europaea L.) Trees and Possibility for Growing in Thailand. <i>Thai Agricultural Research Journal</i>, <i>22</i>(3), 281-298.Sermsakul Pojanagaroon และ Chaweang Kaewrak. "Flowering of Olive (Olea europaea L.) Trees and Possibility for Growing in Thailand". Thai Agricultural Research Journal 22 (2004):281-298.Sermsakul Pojanagaroon และ Chaweang Kaewrak. Flowering of Olive (Olea europaea L.) Trees and Possibility for Growing in Thailand. Department of Agriculture:ม.ป.ท. 2004.