Gary Chapman, Ross Campbell (2010). “The 5 Love Languages/The 5 Love Languages Men's Edition/The 5 Love Languages of Teenagers/The 5 Love Lan”, p.143, Moody Publishers
Gary Chapman, Ross Campbell (2010). “The 5 Love Languages/The 5 Love Languages Men's Edition/The 5 Love Languages of Teenagers/The 5 Love Lan”, p.182, Moody Publishers
Jamie Sams (1993). “The 13 Original Clan Mothers: Your Sacred Path to Discovering the Gifts, Talents, and Abilities of the Feminine Through the Ancient Teachings of the Sisterhood”, Harper San Francisco
Karen Kingston (2016). “Clear Your Clutter with Feng Shui (Revised and Updated): Free Yourself from Physical, Mental, Emotional, and Spiritual Clutter Forever”, p.189, Harmony
Michael J. Silverstein, Dylan Bolden, Rune Jacobsen, Rohan Sajdeh (2015). “Rocket: Eight Lessons to Secure Infinite Growth”, p.6, McGraw Hill Professional
H. Jackson Brown Jr. (2007). “Complete Life's Little Instruction Book: 1,560 Suggestions, Observations, and Reminders on How to Live a Happy and Rewarding Life”, p.41, Thomas Nelson Inc