Não informado. (1980). Enhanced Energy Recovery News. Business Communications.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Enhanced Energy Recovery News. Houston, Tex: Business Communications, 1980.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Enhanced Energy Recovery News. Business Communications, 1980.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.