Akanbi TA, Ajagbe F. The Impact Of Sales Promotion Activities On The Patronage Of Global System Of Mobile Communication (Gsm) Service Providers In Ogbomoso Area, Nigeria. JCC [Internet]. 2011 Dec. 1 [cited 2024 Dec. 22];2(3):20-9. Available from: http://icidr.org.ng/index.php/Jcc/article/view/1005