Παραπομπή σε μορφή APA (7η εκδ.)
Johnston J & Walker L. J. (1999). Guidelines for the Assessment of Indirect and Cumulative Impacts as well as Impact Interactions. European Union. Commission.
Παραπομπή σε μορφή Chicago (17η εκδ.)
Johnston J και Walker L. J. Guidelines for the Assessment of Indirect and Cumulative Impacts as Well as Impact Interactions. European Union. Commission, 1999.
Παραπομπή σε μορφή MLA (9th εκδ.)
Johnston J και Walker L. J. Guidelines for the Assessment of Indirect and Cumulative Impacts as Well as Impact Interactions. European Union. Commission, 1999.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.