Traditional primary sources include journal articles reporting original research, conference proceedings, dissertations or theses, and patents.
Secondary literature includes textbooks, encyclopedias, dictionaries, handbooks, review articles, bibliographies, and indexing and abstracting services.
Lange's Handbook of Chemistry, 15th ed. Ref QD65 .L362 2005
Merck Index: An Encyclopedia of Chemicals, Drugs, and Biologicals
Ref RS51 .M4 2013