^Sagarin, Rafe; Pauchard, Anibal (2014). Observation and Ecology : Broadening the Scope of Science to Understand a Complex World, Island Pr. BiggerBooks. ISBN 9781597268257 (revised Jul 2023)
^ (2013). Observation and Ecology : Broadening the Scope of Science to Understand a Complex WorldECampus. ISBN 9781597268257 (revised Sep 2016)