Lee, Won-jun
Gyore ui kheun seseung Kim Gu = (big mentor fellow) Kim Gu
Jakeun Ssiat, 2009
Buku Teks
Sylff Directory: fellow and faculty Associates 1995
Buku Referensi
Kyohaksa Editorial
Sogdam 3000 = fellow 3000 / Kyohaksa editorial side
Kyohaksa, 2003
Buku Referensi
Maund, Alfred
The big boxcar
University of Illinois Press, 1999
Buku Teks SO
Allen, Frederick Lewis
The Big Change
Bantam Books, 1961
Buku Teks