1.

図書
図書
1. First things first : to live, to love, to learn, to leave a legacy. 1st Fireside ed. (:pbk)
Stephen R. Covey, A. Roger Merrill, Rebecca R. Merrill.
出版情報: New York ; Tokyo : Simon & Schuster, 1995
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2.

図書
図書
2. Principle-centered leadership. 1st ed. (pbk)
Stephen R. Covey
出版情報: New York : Simon & Schuster, 1992
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3.

図書
図書
3. The seven habits of highly effective people : restoring the character ethic
Stephen R. Covey
出版情報: New York : Simon and Schuster, c1990
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