Production of CEA-grown Hydroponic Spinach
- Publication by the Controlled Environment Agricultural (CEA) Program of the College of Agriculture and Life Sciences at Cornell University. An electronic handbook for the production of CEA hydroponic spinach.
- http://www.cornellcea.com/Spinach_Handbook/sp_introduction.htm

Hydroponic Lettuce Production
- Details of setting up and running a lettuce production facility using Controlled Environment Agriculture techniques. Illustrated with descriptive photos. Cornell University.
- http://www.cornellcea.com/Lettuce_Handbook/introduction.htm

Role of Perlite in Hydroponic Culture
- A research report issued by the Perlite Institute, Inc. by Dr. David A. Hall, Principal of the Pershore College of Horiculture in the United Kingdom
- http://www.schundler.com/hydroculture.htm

Crop Physiology Laboratory - Hydroponics
- Excellent source of information for recirculating hydroponics methodology from Utah State University.
- http://www.usu.edu/cpl/research_hydroponics.htm

Hydroponics as a Hobby
- A circular from the Extension at University of Illinois at Urbana-Champaign, offers a basic history and guide to hobby hydroponics.
- http://www.ag.uiuc.edu/~vista/html_pubs/hydro/hydrotoc.html

Home Hydroponics
- An excellent introduction to the hydroponic methodology from the Virginia Cooperative Extension.
- http://www.ext.vt.edu/pubs/envirohort/426-084/426-084.html

How To Produce Green Fodder Hydroponically
- Book on small scale cultivation of green fodder via the hydroponic method. Website in Spanish and English.
- http://orbita.starmedia.com/~carlosarano

The Growing Edge
- A bimonthly magazine dedicated to hydroponics, aquaponics, and greenhouse growing. Provides a wealth of free information for soilless growers.
- http://www.growingedge.com

Growing Hydroponic Tomatoes
- Interactive web site from the University of Arizona provides practical, accurate information on growing hydroponic tomatoes for students, hobbyists, and beginning growers.
- http://www.ag.arizona.edu/hydroponictomatoes/

Institute for Simplified Hydroponics
- Dedicated to supporting efforts to use simplified hydroponics to reduce global hunger and poverty. Offers classes and activities to support the education of simplified hydroponics, especially in developing nations.
- http://www.carbon.org

Hydroponics Resource for Inexpensive Startups
- Secrets for starting hydroponic businesses. Includes information about hydroponic nutrients, maintenance, production, greenhouses, and marketing.
- http://www.mayhillpress.com