Cita APA (7a ed.)

Seekings, J. (1998). The youth travel market. [s.n.].

Cita Chicago Style (17a ed.)

Seekings, John. The Youth Travel Market. [S.l.]: [s.n.], 1998.

Cita MLA (9a ed.)

Seekings, John. The Youth Travel Market. [s.n.], 1998.