Sudharto, Sudharto (2011) Multikulturalisme dalam perspektif empat pilar kebangsaan. Working Paper. Direktorat Jenderal Kebudayaan: BPNB D.I. Yogyakarta, Semarang.

Oemar, Mohammad and Sudaryo, Sudaryo and Suharyono, Suharyono and Waryono, Waryono and Amien, Mohammad and Sudharto, Sudharto and Siregar, Siregar and Sudarno, Sudarno and Prayin, Prayin and Sugianto, Sugianto and Mudiyastuti, Mudiyastuti and Suhandini, Purwadi and Didyatmoko, Suwarno and Prayitno, Budi (1978) Geografi budaya daerah Jawa Tengah. Departemen pendidikan dan kebudayaan, Jakarta.