Kramer, S. N. History begins at Sumer: Thirty-nine firsts in man's recorded history (Third revision edition.).
Chicago Style CitationKramer, Samuel Noah. History Begins At Sumer: Thirty-nine Firsts in Man's Recorded History. Third revision edition.
MLA CitationKramer, Samuel Noah. History Begins At Sumer: Thirty-nine Firsts in Man's Recorded History. Third revision edition.