Effects of message, source, and context on evaluations of employee voice behavior.
Whiting, Steven W.; Maynes, Timothy D.; Podsakoff, Nathan P.; Podsakoff, Philip M.
Journal of Applied Psychology, Aug 15, 2011, No Pagination Specified. doi:
10.1037/a0024871
http://psycnet.apa.org/psycinfo/2011-18050-001/