Cita APA (7a ed.)

Heine, B., Claudi, U., & Hunnemeyer, F. (1991). Grammaticalization: A conceptual framework. University of Chicago Press.

Cita Chicago Style (17a ed.)

Heine, Bernd, Ulrike Claudi, y Friederike Hunnemeyer. Grammaticalization: A Conceptual Framework. Chicago [etc.]: University of Chicago Press, 1991.

Cita MLA (9a ed.)

Heine, Bernd, et al. Grammaticalization: A Conceptual Framework. University of Chicago Press, 1991.