Gaya APA

Umlas, J, W. (2013). Grateful Leadership using the power of acknowledgment to engage all your people and achieve superior results . New York: McGraw-Hill Irwin.

Gaya MLA

Umlas, Judith, W.. "Grateful Leadership using the power of acknowledgment to engage all your people and achieve superior results". New York: McGraw-Hill Irwin, 2013. MM.