Siregar, Khorbina Margomgom, author
Fakultas Teknik Universitas Indonesia, 2019
UI - Skripsi Membership
U. S. Congress Office of Technology Assessment, 1986
Buku Teks
Dyke, Fred Van
McGraw-Hill, 2003
Buku Teks
Badan Pengembangan Konservasi UNS,
Majalah, Jurnal, Buletin
Zackrison, Harry B.
Van Nostrand Reinhold Company, 1984
Buku Teks