(2001, 19. June). Altitude vs sea level. Zugriff unter http://www.pponline.co.uk/encyc/0354.htm
APA (7th ed.) CitationAltitude vs sea level.
Chicago Style (17th ed.) CitationAltitude Vs Sea Level.
MLA (9th ed.) CitationAltitude Vs Sea Level.
Warning: These citations may not always be 100% accurate.