Riyanto, S.(2015).The 1st student's choice TOEFL [ test of english as a foreign language ]: test strategy for structure and written expression (Cet. 2).Yogyakarta:Kerjasama Pustaka Pelajar dan Academika.
Gaya MLA
Riyanto, Slamet."The 1st student's choice TOEFL [ test of english as a foreign language ]: test strategy for structure and written expression".Cet. 2Yogyakarta:Kerjasama Pustaka Pelajar dan Academika,2015.Textbook.