APA-ийн эшлэл(7 дахь хэвлэлт)

Zook, C. (2004). Beyond the Core: Expand Your Market without Abandoning Your Roots. Harvard Business Review Press.

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

Zook, Chris. Beyond the Core: Expand Your Market Without Abandoning Your Roots. Boston, Massachesutts: Harvard Business Review Press, 2004.

MLA -ийн эшлэл (9 дэх хэвлэлт)

Zook, Chris. Beyond the Core: Expand Your Market Without Abandoning Your Roots. Harvard Business Review Press, 2004.