Gaya APA

Bingham, R, C., Walstad, W, B. (1990). Study guide to accompany Mcconnell and brue economics (11th Ed). New York: McGraw Hill.

Gaya MLA

Bingham, Robert, C.., Walstad, William, B.. "Study guide to accompany Mcconnell and brue economics". 11th Ed New York: McGraw Hill, 1990. Text.