Friesen, M. E. (1998). The internal sell: Encouraging executive influence and accomplishment. Quorum Books.
Citazione stile Chigago Style (17a edizione)Friesen, Michael E. The Internal Sell: Encouraging Executive Influence and Accomplishment. Westport, Conn.: Quorum Books, 1998.
Citatione MLA (9a ed.)Friesen, Michael E. The Internal Sell: Encouraging Executive Influence and Accomplishment. Quorum Books, 1998.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.