Gaya APA

Umlas, J, W. (2012). Grateful Leadership : Using The Power of Acknowledgment to Engage All Your People and Achieve Superior Results (Manajemen). Malang: penerbit.

Gaya MLA

Umlas, Judith, W.. "Grateful Leadership : Using The Power of Acknowledgment to Engage All Your People and Achieve Superior Results". Manajemen Malang: penerbit, 2012. .