Harris, D. P. (1969). Testing English as a second language. McGraw-Hill.
Cita Chicago (17th ed.)Harris, David P. Testing English as a Second Language. New York: McGraw-Hill, 1969.
Cita MLA (8th ed.)Harris, David P. Testing English as a Second Language. McGraw-Hill, 1969.
Atenció: Aquestes cites poden no estar 100% correctes.