Buckley, 2003, p.835: «Queen’s combination of hard-rock riffs and intillgently constructed albums, their commercial melodies and a strong visual presence, thus appealed to both markets.» Dinsdale, Steve.Queen//The Rough Guide to Rock: [англ.]/ Peter Buckley, ed..— Rough Guides, 2003.— P.835—837.— ISBN 9781843531050.