This instrument and the pey au (or pei ar) are both used in the Krom phleng arak.
- Sovichet. "ប៉ីអ និង ប៉ីពក [Poetry and Songs]". sovichetlifelwordpress.com.
ប៉ីពក (the name of the instrument in Khmer).
Image of pei pok
- Ung, Chinary (1979). Cambodia Traditional Music (PDF) (Media notes). Tribe Music, Folk Music, and Popular Dances, Ethnic Folkways Records FE 4082. New York: Ethnic Folkways Records. p. 2. Retrieved 26 October 2018.