Gaya APA

Challis, M., Boras, B, K. (2013). E-book The Modern Zoo : Foundations for Management and Development (2nd. ed). Netherlands: EAZA.

Gaya MLA

Challis, M.., Boras, B., Kjellson,. "E-book The Modern Zoo : Foundations for Management and Development". 2nd. ed Netherlands: EAZA, 2013. Text.