6. Conference Report
H.Rpt, H.Conf.Rpt=House Conference Report (may be same as for House Report)
S.Rpt=Senate Conference Report (same as for Senate Report)
example: H.Rpt 111-89
7. Presidential Signing Statement
WCPD=Weekly Compilation of Presidential Documents
DCPD=Daily Compilation of Presidential Documents
See Bluebook Rule 13 for citing rules.
This "old favorite" is a great 3 minute introduction to the Legislative Process. Pay particular attention to the types of documents (see Executive Summary to the left).
For more explanation, see chart below and the Understand Documents Produced tab.