Pfister,Robert E & Tierney,Patrick. Recreation,Event & tourism business. Huaman Kinetics.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPfister,Robert E & Tierney,Patrick. Recreation,Event & Tourism Business. Champaign: Huaman Kinetics.
एमएलए (9वां संस्करण) प्रशस्ति पत्रPfister,Robert E & Tierney,Patrick. Recreation,Event & Tourism Business. Huaman Kinetics.
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