Carl Koch. (1982). Communication skills for college students. National Book Store.
Citazione stile Chigago Style (17a edizione)Carl Koch. Communication Skills for College Students. Manila: National Book Store, 1982.
Citatione MLA (9a ed.)Carl Koch. Communication Skills for College Students. National Book Store, 1982.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.