Prapapan Temkitthawon และ Kornkanok Ingkaninan. (2011) Investiga of phosphodiesterase 5 inhibitory activity from some Thai medicinal plants. Naresuan University:ม.ป.ท.Prapapan Temkitthawon และ Kornkanok Ingkaninan. 2011. Investiga of phosphodiesterase 5 inhibitory activity from some Thai medicinal plants. ม.ป.ท.:Naresuan University;Prapapan Temkitthawon และ Kornkanok Ingkaninan. Investiga of phosphodiesterase 5 inhibitory activity from some Thai medicinal plants. ม.ป.ท.:Naresuan University, 2011. Print.