Washington Irving (2015). “The Complete Works of Washington Irving: Short Stories, Plays, Historical Works, Poetry and Autobiographical Writings (Illustrated): The Entire Opus of the Prolific American Writer, Biographer and Historian, Including The Legend of Sleepy Hollow, Rip Van Winkle, The Sketch Book of Geoffrey Crayon, Bracebridge Hall and many more”, p.39, e-artnow
Stephen R. Covey, A. Roger Merrill, Rebecca R. Merrill (1997). “First Things First Every Day: Daily Reflections- Because Where You're Headed Is More Important Than How Fast You Get There”, p.115, Simon and Schuster
Stephen R. Covey, A. Roger Merrill, Rebecca R. Merrill (1997). “First Things First Every Day: Daily Reflections- Because Where You're Headed Is More Important Than How Fast You Get There”, p.115, Simon and Schuster