Roberts, R. (2012). Yammer starter. Packt Publishing.
Cita Chicago (17th ed.)Roberts, Ralph. Yammer Starter. Birmingham, [Eng.]: Packt Publishing, 2012.
Cita MLA (9th ed.)Roberts, Ralph. Yammer Starter. Packt Publishing, 2012.
Atenció: Aquestes cites poden no estar 100% correctes.