National Research Council (U.S.). Committee on Earth Studies & ebrary, Inc. (2004). Steps to facilitate principal-investigator-led earth science missions. National Academies Press.
Παραπομπή σε μορφή Chicago (17η εκδ.)National Research Council (U.S.). Committee on Earth Studies και Inc ebrary. Steps to Facilitate Principal-investigator-led Earth Science Missions. Washington, D.C.: National Academies Press, 2004.
Παραπομπή σε μορφή MLA (9th εκδ.)National Research Council (U.S.). Committee on Earth Studies και Inc ebrary. Steps to Facilitate Principal-investigator-led Earth Science Missions. National Academies Press, 2004.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.