Ludwig, A. (2015). The new create an oasis with greywater: Integrated design for water conservation : reuse, rainwater harvesting & sustainable landscaping (Revised & expanded 6th edition.). Oasis Design.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Ludwig, Art. The New Create an Oasis with Greywater: Integrated Design for Water Conservation : Reuse, Rainwater Harvesting & Sustainable Landscaping. Revised & expanded 6th edition. Santa Barbara, CA: Oasis Design, 2015.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Ludwig, Art. The New Create an Oasis with Greywater: Integrated Design for Water Conservation : Reuse, Rainwater Harvesting & Sustainable Landscaping. Revised & expanded 6th edition. Oasis Design, 2015.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.