Gaya APA
R, B, ,, L. et al (1988).
Business Model And Activity File For Business in action (edisi 3).
amerika:
Mc Graw Hill Book Company.
Gaya MLA
R, Bittel, ,, Lester. et al.
"Business Model And Activity File For Business in action".
edisi 3
amerika:
Mc Graw Hill Book Company,
1988.
Text.