Outline of The principle : level 4.
Kwak, Chung Hwan.
Unification Church.cn
New York, N.Y. : Holy Spirit Association for the Unification of World Christianity,
c1980.
"This text was written in Korean by Chung Hwan Kwak."--P. xviii.
Based on Wol-li Kang-ron by Hyo Won Eu.--P. xviii.
Unification Church