Willson, R. F. (1980). Writing: Analysis and applications. Instructor's manual and key. Macmillan Publishing.
Citazione stile Chigago Style (17a edizione)Willson, Robert F. Writing: Analysis and Applications. Instructor's Manual and Key. Nueva York: Macmillan Publishing, 1980.
Citatione MLA (9a ed.)Willson, Robert F. Writing: Analysis and Applications. Instructor's Manual and Key. Macmillan Publishing, 1980.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.