John Calvin Maxwell (born 1947) is an American author, speaker, and pastor who has written many books, primarily focusing on leadership. Titles include The 21 Irrefutable Laws of Leadership and The 21 Indispensable Qualities of a Leader. His books have sold millions of copies, with some on the New York Times Best Seller
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মেনটরিং ১০১ (হার্ডকভার) বিজ্ঞ পরামর্শ দ্বারা প্রশিক্ষণ ১০১