Seok, Dong-yeon, author
Manhwa yeongmunbeob gyogwaso 2
Wisdom House, 2009
 Buku Teks
Jong, Su-yong, author
Orini manhwa gosa songo
Walaenem, 2010
 Buku Teks
Eo, Thaek, author
Manhwa gyeong-je gyogwaseo
Scola, 2009
 Buku Teks
Standard specifications for transportation materials and methods of sampling and testing part 1: specifications 4
American Association of State Highway and Transportation Officials, 2008
 Buku Referensi
Standard specifications for transportation materials and methods of sampling and testing part 2: specifications 4
American Association of State Highway and Transportation Officials, 2008
 Buku Referensi
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