Gaya APA

Gunning, J, M, S, ;, T, G. (1986). Skillsbook currents . USA: Houghton Mifflin Company Boston.

Gaya MLA

Gunning, Jo, M., Stanchfield, ;, Thomas, G.. "Skillsbook currents". USA: Houghton Mifflin Company Boston, 1986. Text.