Tip: have not so typical sources to cite? Google "how to cite state legislature APA" and look for answers form APA Style Blog. This is the actual manual's blog answering users' questions; they literally wrote the Manual so you can trust these entries.
Example 1: Vandenberg and Smith (2002) reported that “the current state of the treatment for processing deficits in american public schools is similar to the state of the treatment of processing deficits in Finland from several decades ago” (p. 600).
Ex 2: Currently, the method used in American public schools to treat processing deficits is similar to the treatments used in Finland several decades ago (Vandenberg & Smith, 2002, p.600).
1 Author: use the Authors last name the date of publication.
(Vandenberg, 2008, p.12)
2 Authors: name both authors every time. Use an ‘&’ between the names
(Wegener & Petty, 1998, p.84)
Note: use the word “and” between the authors name when mentioning them within the text. Research by Wegener and Petty (1998) supports...
3-5 Authors: list all the author’s last names the 1st time you cite the source. Use the ‘&.’
(Kernis, Cornell, Sun, Berry, & Harlow, 1993, p.764 )
In subsequent citation use the first author last name then “et al.” and the date of publication.
(Kernis et al., 1993, p.12)
6 or more Authors: Use only the first author’s last name and “et al.”
Use the first author's name followed by “et al.” in the signal phrase or in parentheses.
(Harris et al., 2001, p.3)
Note: in text use the first author’s last name followed by “et al.” and the date of publication in parentheses: Harris et al. (2001) argued...
No page number! Use the paragraph numbers by using the abbreviation "para." (McLee, 1999, para. 6 ).
Information taken from Purdue OWL:APA Formatting and Style