(2008, January). alpha–proton–X-ray spectrometer A Dictionary of Earth Sciences.
Chicago Style (17th ed.) Citation"Alpha–proton–X-ray Spectrometer." A Dictionary of Earth Sciences Jan. 2008.
MLA (9th ed.) Citation"Alpha–proton–X-ray Spectrometer." A Dictionary of Earth Sciences, Jan. 2008.
Warning: These citations may not always be 100% accurate.