Only Man can marry People of the Book and not women.
"This day are (all) things good and pure made lawful unto you. The food of the People of the Book [Jews and Christians] is lawful unto you and yours is lawful unto them. (Lawful unto you in marriage) are (not only) chaste women who are believers, but chaste women among the People of the Book, revealed before your time,- when ye give them their due dowers, and desire chastity, not lewdness, nor secret intrigues if any one rejects faith, fruitless is his work, and in the Hereafter he will be in the ranks of those who have lost (all spiritual good). (The Noble Quran, 5:5)"
However there are many opinions of Islamic Scholars regarding this verse,
http://islamqa.info/en/2527You can see Dr.Zakir Naik's opinion here
http://irf.net/faq/faq5_60.htmlAND Allah knows best!