Evaluasi pelaksanaan push strategy terhadap terjadinya peningkatan penjualan: studi kasus pada operator telepon seluler PT. Telkomsel dan para saluran distribusinya di DKI Jakarta = The evaluation of push strategy implementation on the distribution channel to the sale improvement (research of PT. Telkomsel and the frontliner at the official outlets or counters of Telkomsel in DKI Jakarta are) - Parantean, Richard Christian Somalinggi, author (2007)