Bokow, Jacquelyn Cochran (1997). „Hydrogen Exonerated in Hindenburg Disaster”. National Hydrogen Association. Arhivirano iz originala na datum 2010-01-13. Pristupljeno 11. siječnja 2010. »The NHA's mission is to foster the development of hydrogen technologies and their utilization in industrial, commercial, and consumer applications and promote the role of hydrogen in the energy field.«
Bokow, Jacquelyn Cochran (1997). „Hydrogen Exonerated in Hindenburg Disaster”. National Hydrogen Association. Arhivirano iz originala na datum 2010-01-13. Pristupljeno 11. siječnja 2010. »The NHA's mission is to foster the development of hydrogen technologies and their utilization in industrial, commercial, and consumer applications and promote the role of hydrogen in the energy field.«