APA
Roper S., . (2013). Entrepreneurship. Abingdon, Oxon: Routledge.
Chicago
Roper Stephen, . 2013. Entrepreneurship. Abingdon, Oxon: Routledge.
Harvard
Roper S., . (2013). Entrepreneurship. Abingdon, Oxon: Routledge.
MLA
Roper Stephen, . Entrepreneurship. Abingdon, Oxon: Routledge. 2013.