APA

Gray J., . (1999). Children are from heaven : positive parenting skills for creating cooperative, confident, and compassionate children. New York: HarperCollins.

Chicago

Gray John, . 1999. Children are from heaven : positive parenting skills for creating cooperative, confident, and compassionate children. New York: HarperCollins.

Harvard

Gray J., . (1999). Children are from heaven : positive parenting skills for creating cooperative, confident, and compassionate children. New York: HarperCollins.

MLA

Gray John, . Children are from heaven : positive parenting skills for creating cooperative, confident, and compassionate children. New York: HarperCollins. 1999.