Great Britain. Environmental Information Service & Phillips, A. (1999). 1999 resource guide to the United Kingdom's Environmental and Environmentally Related Organisations: For schools, colleges, universities & futher education users. Environmental Information Service.
Παραπομπή σε μορφή Chicago (17η εκδ.)Great Britain. Environmental Information Service και Alan Phillips. 1999 Resource Guide to the United Kingdom's Environmental and Environmentally Related Organisations: For Schools, Colleges, Universities & Futher Education Users. Norfolk: Environmental Information Service, 1999.
Παραπομπή σε μορφή MLA (9th εκδ.)Great Britain. Environmental Information Service και Alan Phillips. 1999 Resource Guide to the United Kingdom's Environmental and Environmentally Related Organisations: For Schools, Colleges, Universities & Futher Education Users. Environmental Information Service, 1999.