The sources are:
CBE: Coldham, Peter W. The Complete Book of Emigrants 1607-1660
DOR: Dorman, John G. Adventurers of Purse and Person
EEAC: Coldham, Peter W. English Estates of American Colonists
PB: Virginia Land Office Patent Books 1619-1660 (these are digitized at the Library of Virginia)
WAT: Waters, Henry F. Genealogical Gleanings in England, New Series.
I have the book if you need more info.