Reliable Non-Authoritative Sources

In June 2009, the FASB issued SFAS No. 168, The FASB Accounting Standards Codification and Hierarchy of Generally Accepted Accounting Principles, a replacement of FASB Statement No. 162 (SFAS 168). SFAS 168 established the FASB Standards Accounting Codification (Codification) as the source of authoritative U.S. generally accepted accounting principles (GAAP) recognized by the FASB to be applied to nongovernmental entities and rules and interpretive releases of the SEC as authoritative GAAP for SEC registrants.

For discussion: What are some non-authoritative sources of information and how could management of a company utilize information obtained from non-authoritative sources in preparing GAAP financial statements?