Muller, A. Charles (1995). "The Key Operative Concepts in Korean Buddhist Syncretic Philosophy: Interpenetration (通達) and Essence-Function (體用) in Wŏnhyo, Chinul and Kihwa" cited in Bulletin of Toyo Gakuen University No. 3, March 1995, pp 33-48.Source: "Korean Buddhist Syncretic Philosophy". Archived from the original on 29 December 2009. Retrieved 18 September 2008. (accessed: September 18, 2008)
web.archive.org
Muller, A. Charles (1995). "The Key Operative Concepts in Korean Buddhist Syncretic Philosophy: Interpenetration (通達) and Essence-Function (體用) in Wŏnhyo, Chinul and Kihwa" cited in Bulletin of Toyo Gakuen University No. 3, March 1995, pp 33-48.Source: "Korean Buddhist Syncretic Philosophy". Archived from the original on 29 December 2009. Retrieved 18 September 2008. (accessed: September 18, 2008)