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Walter Dill Scott: "Kemungkinan besar pria rata-rata dapat, tanpa cede...

"Kemungkinan besar pria rata-rata dapat, tanpa cedera kesehatannya, meningkatkan efisiensinya lima puluh persen."

--- Walter Dill Scott

Versi Bahasa Inggris

It is more than probable that the average man could, with no injury to his health, increase his efficiency fifty percent.