Gaya APA

Sullivan, D, H., Lloyd, I, C. (1982). Concepts and language of economics a student guide to accompany economics: ì the science of choice . Illinois: Richard D. Irwin, Inc..

Gaya MLA

Sullivan, Dennis, H.., Lloyd, I.Atkinson, C.. "Concepts and language of economics a student guide to accompany economics: ì the science of choice". Illinois: Richard D. Irwin, Inc., 1982. Text.