Hoaas, D., Christensen, H. Study Guide with Practice Tests to Accompany Principles of Economics. Englewood Cliffs, New Jersey: Prentice Hall, 1989 220 с. 0-13-223505-6.
Hoaas, D., Christensen, H. Study Guide with Practice Tests to Accompany Principles of Economics. Englewood Cliffs, New Jersey: Prentice Hall, 1989 220 с. 0-13-223505-6.
Hoaas, D., Christensen, H. (1989) Study Guide with Practice Tests to Accompany Principles of Economics, Englewood Cliffs, New Jersey: Prentice Hall 220 с. 0-13-223505-6.
Hoaas, D., & Christensen, H. (1989). Study Guide with Practice Tests to Accompany Principles of Economics. Englewood Cliffs, New Jersey: Prentice Hall, 220 с.
Hoaas D, Christensen H. Study Guide with Practice Tests to Accompany Principles of Economics. Englewood Cliffs, New Jersey: Prentice Hall; 1989. p. 220 с. ISBN: 0-13-223505-6.