Abdul – Hameed, T. A. (2015). An Appraisal of GSM Telecommunications Services Delivery in Lagos and Oyo States of Nigeria.
Chicago-viite (17. p.)Abdul – Hameed, Taofeek Adekunle. An Appraisal of GSM Telecommunications Services Delivery in Lagos and Oyo States of Nigeria. 2015.
MLA-viite (9. p.)Abdul – Hameed, Taofeek Adekunle. An Appraisal of GSM Telecommunications Services Delivery in Lagos and Oyo States of Nigeria. 2015.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.