Jacobs, S. (2013). Membership rules!: The art of selling what matters (First edition.). Jossey-Bass.
Chicago-viite (17. p.)Jacobs, Sheri. Membership Rules!: The Art of Selling What Matters. First edition. San Francisco, CA: Jossey-Bass, 2013.
MLA-viite (9. p.)Jacobs, Sheri. Membership Rules!: The Art of Selling What Matters. First edition. Jossey-Bass, 2013.
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