Gretchen Rubin
Gretchen Craft Rubin is an American author, blogger and speaker.
Excerpt from Wikipedia, available under CC BY-SA 4.0.
Books
The happiness project
2015
ISBN 9780062474247
The Happiness Project Or, Why I Spent a Year Trying to Sing in the Morning, Clean My Closets, Fight Right, Read Aristotle, and Generally Have More Fun
2009
ISBN 9780061962066
Better than before
2015
ISBN 9781444769029
Better Than Before Mastering the Habits of Our Everyday Lives
2015
ISBN 9781410483560