Johnson, V. E. (1986). Intervention: How to help someone who doesn't want help: a step-bystep guide for families and friends of chemically dependent persons. Johnson Institute Books.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Johnson, Vernon E. Intervention: How to Help Someone Who Doesn't Want Help: A Step-bystep Guide for Families and Friends of Chemically Dependent Persons. Johnson Institute Books, 1986.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Johnson, Vernon E. Intervention: How to Help Someone Who Doesn't Want Help: A Step-bystep Guide for Families and Friends of Chemically Dependent Persons. Johnson Institute Books, 1986.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.