APA (7e ed.) Bronvermelding

THOMSON, A. (1970). A practical English grammar: Exercises 1-6. E.L.B.S.,O.U.P.

Chicago (17e ed.) Bronvermelding

THOMSON, A.J. A Practical English Grammar: Exercises 1-6. London: E.L.B.S.,O.U.P, 1970.

MLA (9e ed.) Bronvermelding

THOMSON, A.J. A Practical English Grammar: Exercises 1-6. E.L.B.S.,O.U.P, 1970.