APA
Johnson J. M., Maher J. W., Samuel I., Heitshusen D., Doherty C. & Downs R. W. (20060316). Effects of gastric bypass procedures on bone mineral density, calcium, parathyroid hormone, and vitamin D. : Journal of gastrointestinal surgery : official journal of the Society for Surgery of the Alimentary Tract.
Chicago
Johnson Jason M, Maher James W, Samuel Isaac, Heitshusen Deborah, Doherty Cornelius and Downs Robert W. 20060316. Effects of gastric bypass procedures on bone mineral density, calcium, parathyroid hormone, and vitamin D. : Journal of gastrointestinal surgery : official journal of the Society for Surgery of the Alimentary Tract.
Harvard
Johnson J. M., Maher J. W., Samuel I., Heitshusen D., Doherty C. and Downs R. W. (20060316). Effects of gastric bypass procedures on bone mineral density, calcium, parathyroid hormone, and vitamin D. : Journal of gastrointestinal surgery : official journal of the Society for Surgery of the Alimentary Tract.
MLA
Johnson Jason M, Maher James W, Samuel Isaac, Heitshusen Deborah, Doherty Cornelius and Downs Robert W. Effects of gastric bypass procedures on bone mineral density, calcium, parathyroid hormone, and vitamin D. : Journal of gastrointestinal surgery : official journal of the Society for Surgery of the Alimentary Tract. 20060316.