||Krupovic M, Prangishvili D, Hendrix RW, Bamford DH. Genomics of bacterial and archaeal viruses: dynamics within the prokaryotic virosphere. Microbiol Mol Biol Rev. 2011 Dec75(4):610-35. doi: 10.1128/MMBR.00011-11 p.611 right column bottom paragraph and p.612 right column bottom paragraphPubMed ID22126996
|| Ackermann HW. 5500 Phages examined in the electron microscope. Arch Virol. 2007 Feb152(2):227-43 DOI: 10.1007/s00705-006-0849-1PubMed ID17051420
||Primary source abstract: ""Phages" include viruses of eubacteria and archaea. At least 5568 phages have been examined in the electron microscope since the introduction of negative staining in 1959."
||P.611 right column bottom paragraph: "The tailed dsDNA phages, classified in the order Caudovirales, are the viruses that most people associate with the term bacteriophage. They constitute >90% of the phages reported in the literature (primary source) and may also make up a majority of all bacteriophages in nature, although the jury is still out on the latter point." P.612 right column bottom paragraph: "As mentioned above, tailed phages represent the dominant morphotype among characterized bacterial viruses: of more than 5,500 prokaryotic viruses examined under an electron microscope by the end of 2006, 96% were tailed (primary source)." Primary source abstract: "Most virions (96%) are tailed."