Cita APA (7a ed.)
Andreas Freytag, R. T. Entrepreneurship and Culture. Springer.
Cita estilo Chicago (17a ed.)
Andreas Freytag, Roy Thurik. Entrepreneurship and Culture. Berlín, Alemania: Springer.
Cita MLA (9a ed.)
Andreas Freytag, Roy Thurik. Entrepreneurship and Culture. Springer.
警告：這些引文格式不一定是100％准確.