APA

Tropman J. E., Morningstar G., . (1989). Entrepreneurial systems for the 1990s: their creation, structure, and management. New York: Quorum Books.

Chicago

Tropman John E, Morningstar Gersh, . 1989. Entrepreneurial systems for the 1990s: their creation, structure, and management. New York: Quorum Books.

Harvard

Tropman J. E., Morningstar G., . (1989). Entrepreneurial systems for the 1990s: their creation, structure, and management. New York: Quorum Books.

MLA

Tropman John E, Morningstar Gersh, . Entrepreneurial systems for the 1990s: their creation, structure, and management. New York: Quorum Books. 1989.