Ziglar, Z., & Vương Bảo Long. (2015). Nghệ thuật bán hàng bậc cao =: Secrets of closing the sale. TP Hồ Chí Minh: Tổng hợp.
শিকাগো স্টাইলে সাইটেশনZiglar, Zig, এবং Vương Bảo Long. Nghệ Thuật Bán Hàng Bậc Cao =: Secrets of Closing the Sale. TP Hồ Chí Minh: Tổng hợp, 2015.
এমএলএ সাইটেশনZiglar, Zig, এবং Vương Bảo Long. Nghệ Thuật Bán Hàng Bậc Cao =: Secrets of Closing the Sale. TP Hồ Chí Minh: Tổng hợp, 2015.
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