Essence and essentials of purposive communications in the 21st century 
Rizal O. Dapat. 
 -  books Atbp. Publishing Corp.,  2018 
 - xii,302pages.: ill. 
978-6-214-09109-6
Communication.
F 302.2 E785 2018
                        978-6-214-09109-6
Communication.
F 302.2 E785 2018