Sears, J. H. (1905). The physical geography geology, mineralogy and paleontology of Essex County, Massachusetts. Essex Inst.
Chicago-Zitierstil (17. Ausg.)Sears, John Henry. The Physical Geography Geology, Mineralogy and Paleontology of Essex County, Massachusetts. Salem, Mass: Essex Inst, 1905.
MLA-Zitierstil (9. Ausg.)Sears, John Henry. The Physical Geography Geology, Mineralogy and Paleontology of Essex County, Massachusetts. Essex Inst, 1905.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.