APA (7th ed.) Citation

Lipsey, Paul N. Courant, & Christopher T.S.Ragan. (1999). Economics (Twelfth ed.). Longman.

Chicago Style (17th ed.) Citation

Lipsey, Paul N. Courant, and Christopher T.S.Ragan. Economics. Twelfth ed. Reading,Mass: Longman, 1999.

MLA (8th ed.) Citation

Lipsey, et al. Economics. Twelfth ed. Longman, 1999.