Cita APA (7a ed.)
Walters, R. P. (1981). How to be a friend: People want to be friends with... Regal.
Cita Chicago Style (17a ed.)
Walters, Richard P. How to Be a Friend: People Want to Be Friends with... Carlifornia: Regal, 1981.
Cita MLA (9a ed.)
Walters, Richard P. How to Be a Friend: People Want to Be Friends with... Regal, 1981.
Precaución: Estas citas no son 100% exactas.