(1973). The energy index: A selected guide to energy literature since 1970. New York: Environment Information Center.
Παραπομπή Chicago StyleThe Energy Index: A Selected Guide to Energy Literature Since 1970. New York: Environment Information Center, 1973.
Παραπομπή MLAThe Energy Index: A Selected Guide to Energy Literature Since 1970. New York: Environment Information Center, 1973.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.