Gaya APA

Zook, C. (2004). Beyond The Core: Expand Your Market Without Abandoning Your Roots (Edisi 1). United State of America: Harvard Business review press.

Gaya MLA

Zook, Chris. "Beyond The Core: Expand Your Market Without Abandoning Your Roots". Edisi 1 United State of America: Harvard Business review press, 2004. TEXT.