(1993). Workpapers. s.n.
Cita Chicago Style (17a ed.)Workpapers. S.l: s.n, 1993.
Cita MLA (9a ed.)Workpapers. s.n, 1993.
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Cita APA (7a ed.)
(1993). Workpapers. s.n.
Cita Chicago Style (17a ed.)Workpapers. S.l: s.n, 1993.
Cita MLA (9a ed.)Workpapers. s.n, 1993.