Oberg, Erik
Machinery's handbook. 29th edition
Industrial Press, 2012
 Multimedia
Physician's handbook : nineteenth edition
by Marcus A. Krupp ... [and others]
Lange Medical Publications, 1979
 Buku Referensi
Erik Obeng
Machinery's handbook. 29th edition
Industrial Press, 2012
 Multimedia
Handbook of qualitative research : second edition
Norman K. Denzin, Yvonna S. Lincoln, editors
Sage Publications, 2000
 Buku Referensi
The handbook of communication skill: second edition
editor, Owen D.W. Hargie
Routledge, 1997
 Buku Referensi