APA

ibbotson (Mark), . (2009). Cambridge English for Engineering (2 CD). : .

Chicago

ibbotson (Mark), . 2009. Cambridge English for Engineering (2 CD). : .

Harvard

ibbotson (Mark), . (2009). Cambridge English for Engineering (2 CD). : .

MLA

ibbotson (Mark), . Cambridge English for Engineering (2 CD). : . 2009.