APA Style
Johns, C. (2010).
Bahamas Blue Holes: DIVE INTO BEAUTY, DANGER, AND DISCOVERY .
washington:
National GeographicSociety.
MLA Style
Johns, Chris.
"Bahamas Blue Holes: DIVE INTO BEAUTY, DANGER, AND DISCOVERY".
washington:
National GeographicSociety,
2010.
TextBook (Hardcopy).