Yi, Tog-il, author
Uri yoksa ui susukkekki
Kimyongsa , 2004
 Buku Teks
Bodanis, David
The secret family : twenty-for hours inside the mysterious world of our minds and bodies / David Bodanis
Simon & Schuster , 1997
 Buku Teks
Southwick, Charles H., author
Ecology and the quality of our environment
D. Van Nostrand, 1976
 Buku Teks
Southwick, Charles H., author
Ecology and the quality of our environment
D. Van Nostrand, 1972
 Buku Teks
Easter Islan: archaeology, ecology and culture / Jo Anne Van Tilburg
Britsh Museum Press, 1994
 Buku Teks
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