एपीए उद्धरण

Magretta, J., & Joan Magretta. Understanding Michael Porter: The essential guide to competition and strategy. Boston, Mass: Harvard Business Review Press.

शिकागो स्टाइल उद्धरण

Magretta, Joan, और Joan Magretta. Understanding Michael Porter: The Essential Guide to Competition and Strategy. Boston, Mass: Harvard Business Review Press.

एमएलए उद्धरण

Magretta, Joan, और Joan Magretta. Understanding Michael Porter: The Essential Guide to Competition and Strategy. Boston, Mass: Harvard Business Review Press.