Gaya APA

Ridwan, M., Amanah, U, N. (2019). Fundamental frequency and tone in arabic vowels and consonants by indonesian speakers aged 5 years old . Yogyakarta: Faculty of Cultural Sciences UGM.

Gaya MLA

Ridwan, Muhammad., Amanah, Ulfah, Nurul. "Fundamental frequency and tone in arabic vowels and consonants by indonesian speakers aged 5 years old". Yogyakarta: Faculty of Cultural Sciences UGM, 2019. Artikel.