Cita APA (7a ed.)

Heyd, T. (1999). Rock art aesthetics: Trace on rock, mark of spirit, window on land. [s.n.].

Cita Chicago Style (17a ed.)

Heyd, Thomas. Rock Art Aesthetics: Trace on Rock, Mark of Spirit, Window on Land. [S.l.]: [s.n.], 1999.

Cita MLA (9a ed.)

Heyd, Thomas. Rock Art Aesthetics: Trace on Rock, Mark of Spirit, Window on Land. [s.n.], 1999.