APA (7th ed.) Citation

Kurniawan, S., Mahmud , M., & Nugroho, Y. (2006). A study of the use of mobile phones by older persons.

Chicago Style (17th ed.) Citation

Kurniawan, Sri, Murni Mahmud , and Yanuar Nugroho. A Study of the Use of Mobile Phones by Older Persons. 2006.

MLA (8th ed.) Citation

Kurniawan, Sri, et al. A Study of the Use of Mobile Phones by Older Persons. 2006.