As women's earning power has been increasing, some authors are starting to write books on how women should invest their money.

Over time, women have become a financial force to be reckoned with in the U.S. That's why the book "The Seven Pearls of Financial Wisdom" was written specifically for women who are supporting an aging parent, are concerned about having children, don't like their jobs, or depend on income from another earner, according to the Wall Street Journal.

Written by financial planner Carol Pepper and Forbes Columnist Camilla Webster, the book talks about life outside of the traditional workplace and how women can invest their money, according to the article. The authors target a female audience, as women have become a strong financial force in the nation.

Women have handled the finances in marriage for quite some time now and their financial credence is growing, according to the article. The Pew Research Center conducted a study in 2010 that revealed that in one in five couples, the woman makes more money than the man. That's up from just 4 percent in 1970.

But even with this increased earning power, a lot of women in the world today struggle over when they should have a baby or if they should get a prenuptial agreement, according to the article. The authors aim to answer those questions and more in the book.