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Yep, the one written about 40 years ago ... although it has been revised and updated for today's market. Of course, they're confusing frugality and simplicity: leading a simple life is a lifestyle that is far from lack (which the term "frugality" might suggest). Simplify your lifestyle and enrich your life - simplicity isn't about loss, it's about gain.
If you're interested in reading more about living a simple life, here are some Simplicity books worth your time:
Finding Happiness by Christopher Jamison
100 Ways to Simplify Your Life by Joyce Meyer
Choosing Simplicity: Real People Finding Peace and Fulfillment in a Complex World by Linda Breen Pierce
Living the Simple life: A Guide to Scaling Down and Enjoying More by Elaine St. James
Voluntary Simplicity, Revised Edition: Toward a Life that is Inwardly Simple, Outwardly Rich by Duane Elgin
The Simple Living Guide by Janet Luhrs
The Complete Idiot's Guide to Simple Living
Affluenza: The All-Consuming Epidemic by John de Graaf, David Wann, Thomas H. Naylor
Self-Reliance by Ralph Waldo Emerson
Walden by Henry David Thoreau
Approval Addiction: Overcoming Your Need to Please Everyone by Joyce Meyer
For more, check out Books to Read at Everyday Simplicity.