AUTHOR=Cappi Alberto TITLE=Book review: “Extragalactic astronomy and cosmology—an introduction” JOURNAL=Frontiers in Astronomy and Space Sciences VOLUME=2 YEAR=2015 URL=https://www.frontiersin.org/journals/astronomy-and-space-sciences/articles/10.3389/fspas.2015.00005 DOI=10.3389/fspas.2015.00005 ISSN=2296-987X