Cita APA (7a ed.)
Hardwick, P., Khan, B., & Langmead, J. (1991). <An> Introduction to Modern Economics (3. ed.). Longman.
Cita Chicago Style (17a ed.)
Hardwick, Philip, Bahadur Khan, y John Langmead. <An> Introduction to Modern Economics. 3. ed. London: Longman, 1991.
Cita MLA (9a ed.)
Hardwick, Philip, et al. <An> Introduction to Modern Economics. 3. ed. Longman, 1991.
Precaución: Estas citas no son 100% exactas.