Here are some sources for marriage records:
(1) Marriage bonds, licenses, returns found at the local court house.
(2) Newspaper notices.
(3) Compiled genealogies & local histories - you'll need to confirm them with primary sources.
(4) Church records.
(5) Town or local court records.
(7) Family Bible
(8) Deeds, wills, probate records. Paper was at a premium during the 1600s - 1800s, so every now ans then a marriage [birth or death] was recorded in the margins.