APA-viite (7. p.)
Needle, D. Business in context: An introduction to business and its environment. Cengage.
Chicago-viite (17. p.)
Needle, David. Business in Context: An Introduction to Business and Its Environment. Cengage.
MLA-viite (9. p.)
Needle, David. Business in Context: An Introduction to Business and Its Environment. Cengage.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.