雷源萊

解決問題的藝術 by: 艾可夫(Ackoff, Russell L.); 雷源萊 (Language materials, printed) , [譯]

低預算高效能廣告法 by: 斯拉特斯基(Slutsky, Jeff); 雷源萊 (Language materials, printed) , [譯]

怎樣做最能贏得顧客 by: 萊托(Lytle, John F.); 雷源萊 (Language materials, printed) , [譯]