Nichols, Herbert L.
Moving the earth : The workbook of excavation
McGraw-Hill, 1976
Buku Referensi
Turner, Joe M.
Excavation systems: planning, design, and safety
McGraw-Hill, 2009
Buku Teks
Church, Horace K.
Excavation handbook
McGraw-Hill, 1981
Buku Referensi
Nichols, Herbert L.
Moving the earth: the workbook of excavation
McGraw-Hill, 2010
Buku Teks
Muccigrosso
Basic history of American conservatism
Krieger publishing company, 2001
Buku Teks