홍시환 Si-hwan Hong. (1990). 한국의 동굴 Han'gug-ŭi tonggul 96. Taewonsa.
Chicago Style (17th ed.) Citation홍시환 Si-hwan Hong. 한국의 동굴 Han'gug-ŭi Tonggul 96. Seoul: Taewonsa, 1990.
MLA (8th ed.) Citation홍시환 Si-hwan Hong. 한국의 동굴 Han'gug-ŭi Tonggul 96. Taewonsa, 1990.
Warning: These citations may not always be 100% accurate.