(a) Illinois Register – official weekly record of State agency activity including proposed and adopted rules
http://www.cyberdriveillinois.com/departments/index/register/home.html
(b) Illinois Administrative Code
http://www.ilga.gov/commission/jcar/admincode/titles.html
(c) Gubernatorial Documents – executive orders and other official documents are published within the Illinois Register.
(a) Federal Register
Federal agency regulations must be published in proposed form and again in final form. Regulations first appear in the Federal Register, a daily publication that presents agency business in chronological order, showing what is done on a day to day basis.
https://www.gpo.gov/searchwebapp/browse/collection.action?collectionCode=FR​
Also available on Nexis Unis and Westlaw Campus Research
Citation by volume and page number: 44 F.R. 38,252
(b) Code of Federal Regulations
Once regulations are published in final form, they are organized by agency and published in the Code of Federal Regulations (CFR). The CFR arranges regulations by subject and organizes them into 50 titles, which are subdivided into parts, and further subdivided into sections.
https://www.gpo.gov/searchwebapp/browse/collectionCfr.action?collectionCode=CFR
Also available on Lexis Nexis and Westlaw Campus Research
Citation by title and section number: 28 C.F.R. 551.83
(c) Presidential Documents the President issues Executive Orders, Proclamations, and other documents of legal effect.
Compilation of Presidential Documents
https://www.gpo.gov/searchwebapp/browse/collection.action?collectionCode=CPD