IEEE Global Telecommunications Conference Phoenix, Ariz, IEEE Communications Society, & Institute of Electrical and Electronics Engineers (U.S.). Phoenix Section. (1991). GLOBECOM '91: IEEE Global Telecommunications Conference, Phoenix, Arizona, December 2-5, 1991 : "Countdown to the new millenium", featuring a mini-theme on: Personal Communications Services (PCS). Institute of Electrical and Electronics Engineers.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিIEEE Global Telecommunications Conference Phoenix, Ariz, IEEE Communications Society, এবং Institute of Electrical and Electronics Engineers (U.S.). Phoenix Section. GLOBECOM '91: IEEE Global Telecommunications Conference, Phoenix, Arizona, December 2-5, 1991 : "Countdown to the New Millenium", Featuring a Mini-theme on: Personal Communications Services (PCS). Piscataway, N.J.: Institute of Electrical and Electronics Engineers, 1991.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিIEEE Global Telecommunications Conference Phoenix, Ariz, et al. GLOBECOM '91: IEEE Global Telecommunications Conference, Phoenix, Arizona, December 2-5, 1991 : "Countdown to the New Millenium", Featuring a Mini-theme on: Personal Communications Services (PCS). Institute of Electrical and Electronics Engineers, 1991.