http://www.unfpa.org/emergencies/manual/a1.htm
http://www.k12.wa.us/CurriculumInstruct/communications/Standards/default.aspx
http://www.shkaminski.com/Classes/Handouts/Communication%20Models.htm#_What_is_a_Model
http://o0o0najlao0o0.com/?p=103
http://telc.tanta.edu.eg/hosting/pro14/containt/L2-2.htm
http://kenanaonline.com/users/wageehelmorssi/posts/268973
http://www.k12.wa.us/CurriculumInstruct/communications/Standards/default.aspx
http://www.shkaminski.com/Classes/Handouts/Communication%20Models.htm#_What_is_a_Model
http://o0o0najlao0o0.com/?p=103
http://telc.tanta.edu.eg/hosting/pro14/containt/L2-2.htm
http://kenanaonline.com/users/wageehelmorssi/posts/268973