Topbaş, A., & Kömür, Ş. (2009). Computer-assisted teaching of the past simple and past participle forms of English irregular verbs. Muğla: Muğla University.

Topbaş, Atabay, and Şevki Kömür. Computer-assisted Teaching of the Past Simple and Past Participle Forms of English Irregular Verbs. Muğla: Muğla University, 2009.

Topbaş, Atabay, and Şevki Kömür. Computer-assisted Teaching of the Past Simple and Past Participle Forms of English Irregular Verbs. Muğla: Muğla University, 2009.