BENEDICT, P. K. (1975). "MORTAR", Austro-Thai Language and Culture, with a Glossary of Roots. New Haven, CT: HRAF Press; Human Relations Area Files, Inc. p. 38. ISBN978-087-5-36323-3, 0-87536-323-7LCCN67-30152 :- "T. *grok "mortar"; Mak sok<grok "pound in a mortar"; reconstruction: AT *-kroŋ/krok/grok."
BENEDICT, P. K. (1975). "MORTAR", Austro-Thai Language and Culture, with a Glossary of Roots. New Haven, CT: HRAF Press; Human Relations Area Files, Inc. p. 38. ISBN978-087-5-36323-3, 0-87536-323-7LCCN67-30152 :- "T. *grok "mortar"; Mak sok<grok "pound in a mortar"; reconstruction: AT *-kroŋ/krok/grok."
vajirayana.org
Sepa Rueang Khun Chang Khun Phaen [Khun Chang Khun Phaen poem, version by Wachirayan Royal Library of Siam] เสภาเรื่องขุนช้างขุนแผน ฉบับหอพระสมุดวชิรญาณ (in Thai). Online Wachirayan Royal Library of Siam. Retrieved on 26 February 2024.