↑ "International Docking Standardization" (pdf). NASA. 2009-03-17. p. 15. สืบค้นเมื่อ 2011-03-04. Gender Mating vs. Androgynous Mating ... Hard Docking vs. Soft Capture
↑ "Advanced Docking/Berthing System - NASA Seal Workshop" (PDF). NASA. 2004-11-04. p. 15. สืบค้นเมื่อ 2011-03-04. Berthing refers to mating operations where an inactive module/vehicle is placed into the mating interface using a Remote Manipulator System-RMS.
