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