APA Style
Koch, R. (1998).
The 80/20 Principle: The Secret of Achieving More with Less (cet. 2).
London:
NICHOLAS BREALEY PUBLISHING.
MLA Style
Koch, Richard.
"The 80/20 Principle: The Secret of Achieving More with Less".
cet. 2
London:
NICHOLAS BREALEY PUBLISHING,
1998.
Text.