APA

mubarak m. h., hassan a. k., .Principles and Methods of E.L.T. الخرطوم: sudan university of science and technology.

Chicago

mubarak muntasir hassan, hassan abdel karim, .Principles and Methods of E.L.T. الخرطوم: sudan university of science and technology.

Harvard

mubarak m. h., hassan a. k., .Principles and Methods of E.L.T. الخرطوم: sudan university of science and technology.

MLA

mubarak muntasir hassan, hassan abdel karim, .الخرطوم: sudan university of science and technology. .