Gaya APA

Powers, B., W., ,., M. (2008). Impressioning Compendium Espertise™ A guideline for excellent impressions in theory and practice (2008). Germany: St. Paul, MN, USA and Seefeld,.

Gaya MLA

Powers, Bernd, Wöstmann, ,John, M.. "Impressioning Compendium Espertise™ A guideline for excellent impressions in theory and practice". 2008 Germany: St. Paul, MN, USA and Seefeld,, 2008. Buku Pelajaran.