http://id.m.wikipedia.org/wiki/Kalender_Hijriyah

http://sains.kompas.com/read/2014/11/06/20363101/Kalender.Jawa.Akulturasi.Budaya.Islam-Hindu

http://nationalgeographic.co.id/berita/2014/11/akulturasi-budaya-dalam-kalender-jawa

http://id.m.wikipedia.org/wiki/Kalender_Saka

http://id.m.wikipedia.org/wiki/Kalender_Jawa