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Many FamilySearch records
(eg census) give nice citations, that are easy to copy and paste into Gramps like a set of marriage records that FamilySearch has scanned, compiled, and put online.
This is an example of a Gramps citation for an FamilySearch record without a citation given to us. The important thing is to use sensible values in the Gramps citation Volume/Page text-box that ensure we uniquely identify the record.