Berra, A., et al. Case Studies Book on Entrepreneurship and Innovation & Business Creation and Management. Ruse: Ruse University, Bulgaria, 2011 236 с. 978-954-712-517-9.
Berra, A., et al. Case Studies Book on Entrepreneurship and Innovation & Business Creation and Management. Ruse: Ruse University, Bulgaria, 2011 236 с. 978-954-712-517-9.
Berra, A., et al. (2011) Case Studies Book on Entrepreneurship and Innovation & Business Creation and Management, Ruse: Ruse University, Bulgaria 236 с. 978-954-712-517-9.
Berra, A., & et al. (2011). Case Studies Book on Entrepreneurship and Innovation & Business Creation and Management. Ruse: Ruse University, Bulgaria, 236 с.
Berra A, et A. Case Studies Book on Entrepreneurship and Innovation & Business Creation and Management. Ruse: Ruse University, Bulgaria; 2011. p. 236 с. ISBN: 978-954-712-517-9.