These reference works contain authoritative articles on topics in chemical engineering and related subjects. Written by experts in their respective fields, the articles contain extensive bibliographies of journal articles for further information. You can browse each reference work by topic or article title or search across the full text.
Here's a selected list of the more recent reference works, with publication dates included, to give you an idea of how current the articles are. Kirk-Othmer and Ullmann's are updated several times a year, so you need to check the publication date on the article to see how "recent" it is. Some articles have been added or updated in the last 2-3 years, while others are 20+ years old.