Halvorson, H. G., & Kaye, R. Reinforcements: How to Get People to Help You. Gildan Media.
Cita Chicago Style (17a ed.)Halvorson, Heidi Grant, y Randye Kaye. Reinforcements: How to Get People to Help You. Gildan Media.
Cita MLA (9a ed.)Halvorson, Heidi Grant, y Randye Kaye. Reinforcements: How to Get People to Help You. Gildan Media.
Precaución: Estas citas no son 100% exactas.
