More precisely it's US style. British style puts the full stop outside the quote unless it's part of the quotation. http://www.thepunctuationguide.com/british

More precisely it's US style. British style puts the full stop outside the quote unless it's part of the quotation. http://www.thepunctuationguide.com/british-versus-american-style.html http://www.thepunctuationguide.com/british-versus-american-s...