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- GREGORY, Paul R. - STUART, Robert C. Comparing Economic Systems in the Twenty-First Century. 7th Edition. Mason : South-Western Cengage Learning, 2004. 558 s. ISBN 978-0-618-26181-9. [Copy count : 1, currently available 1, at library only 0]
- RUFFIN, Roy J. - GREGORY, Paul R. Principles of Economics. 5th Edition. New York : Harper Collins College Publishers, 1993. 300 s. ISBN 0-673-46590-X. [Copy count : 1, currently available 1, at library only 0]
- GREGORY, Paul R. Essentials of Economics. 2. ed. Glenview : Scott, Foresman and Co., 1990. 516 s. ISBN 0-673-38842-5. [Copy count : 1, currently available 1, at library only 0]