Backus, W. (1991). The good news about worry. Bethany house.
Chicagoスタイル(17版)引用形式Backus, William. The Good News About Worry. Minneapolis: Bethany house, 1991.
MLA(9版)引用形式Backus, William. The Good News About Worry. Bethany house, 1991.
警告: この引用は必ずしも正確ではありません.