Cita APA (7th ed.)

Petrus, D. A., & Warda, M. (2003). How to start a business in Pennsylvania (3rd ed.). Sphinx Pub..

Cita Chicago (17th ed.)

Petrus, Desiree A., i Mark Warda. How to Start a Business in Pennsylvania. 3rd ed. Naperville, Ill.: Sphinx Pub., 2003.

Cita MLA (9th ed.)

Petrus, Desiree A., i Mark Warda. How to Start a Business in Pennsylvania. 3rd ed. Sphinx Pub., 2003.