Bangs, D. H., Jr. (1996). Smart steps to smart choices: Testing your business ideas (2nd ed.). Upstart Publishing Company, Inc.
Chicago-viite (17. p.)Bangs, David H., Jr. Smart Steps to Smart Choices: Testing Your Business Ideas. 2nd ed. Chicago, Illinois: Upstart Publishing Company, Inc, 1996.
MLA-viite (9. p.)Bangs, David H., Jr. Smart Steps to Smart Choices: Testing Your Business Ideas. 2nd ed. Upstart Publishing Company, Inc, 1996.
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