Barreto, H. The Entrepreneur in Microeconomic Theory. London, New York: Routledge, 1989 XII, 156 с. : със сх. 0-415-00929-4.
Barreto, H. The Entrepreneur in Microeconomic Theory. London, New York: Routledge, 1989 XII, 156 с. : със сх. 0-415-00929-4.
Barreto, H. (1989) The Entrepreneur in Microeconomic Theory, London, New York: Routledge XII, 156 с. : със сх. 0-415-00929-4.
Barreto, H. (1989). The Entrepreneur in Microeconomic Theory. Disappearance and Explanation. London, New York: Routledge, XII, 156 с. : със сх.
Barreto H. The Entrepreneur in Microeconomic Theory: Disappearance and Explanation. London, New York: Routledge; 1989. p. XII, 156 с. : със сх. ISBN: 0-415-00929-4.