Cita APA (7a ed.)

Nelson, K. (1988). Where do taxonomic categories come from? [s.n.].

Cita Chicago Style (17a ed.)

Nelson, Katherine. Where Do Taxonomic Categories Come from? [S.l.]: [s.n.], 1988.

Cita MLA (9a ed.)

Nelson, Katherine. Where Do Taxonomic Categories Come from? [s.n.], 1988.