National water well Association. (1985). Well drilling manual. National water well Association.
استشهاد بنمط شيكاغوNational water well Association. Well Drilling Manual. India: National water well Association, 1985.
MLA استشهادNational water well Association. Well Drilling Manual. National water well Association, 1985.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.