Smolko. Jethro Tull's Thick as a Brick and A Passion Play. Indiana University Press.
Čikaški stil citiranja (17. izdanje)Smolko. Jethro Tull's Thick as a Brick and A Passion Play. Indiana University Press.
MLA način citiranja (9. izdanje)Smolko. Jethro Tull's Thick as a Brick and A Passion Play. Indiana University Press.
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