Tohutoro APA (7th ed.)
Andreas Freytag, R. T. Entrepreneurship and Culture. Springer.
Tohutoru Kātū Chicago (17th ed.)
Andreas Freytag, Roy Thurik. Entrepreneurship and Culture. Berlín, Alemania: Springer.
Tohutoro MLA (9th ed.)
Andreas Freytag, Roy Thurik. Entrepreneurship and Culture. Springer.
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