Não informado. (1970). Energy. U.S. Department of Commerce, National Technical Information Service.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Energy. Springfield, Va: U.S. Department of Commerce, National Technical Information Service, 1970.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Energy. U.S. Department of Commerce, National Technical Information Service, 1970.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.