Butt, D. (2000). Using functional grammar: An explorer's guide (2nd ed.). Sydney: National centre for English language teaching and research, Macquarie University.
استشهاد بنمط شيكاغوButt, David. Using Functional Grammar: An Explorer's Guide. 2nd ed. Sydney: National centre for English language teaching and research, Macquarie University, 2000.
MLA استشهادButt, David. Using Functional Grammar: An Explorer's Guide. 2nd ed. Sydney: National centre for English language teaching and research, Macquarie University, 2000.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.