Gaya APA
arem, joel. (1977).
Color encyclopedia of gemstones .
New York:
Van Nostrand Reinhold Company.
Gaya Chicago
arem, joel.
Color encyclopedia of gemstones.
New York:
Van Nostrand Reinhold Company,
1977.
Text.
Gaya MLA
arem, joel.
Color encyclopedia of gemstones.
New York:
Van Nostrand Reinhold Company,
1977.
Text.
Gaya Turabian
arem, joel.
Color encyclopedia of gemstones.
New York:
Van Nostrand Reinhold Company,
1977.
Print.