Silier, Y., & Silier, Y. (2005). Freedom: Political, metaphysical, negative, and positive. Ashgate.
Cita Chicago Style (17a ed.)Silier, Yildiz, y Yıldız Silier. Freedom: Political, Metaphysical, Negative, and Positive. Aldershot [u.a.]: Ashgate, 2005.
Cita MLA (8a ed.)Silier, Yildiz, y Yıldız Silier. Freedom: Political, Metaphysical, Negative, and Positive. Ashgate, 2005.
Precaución: Estas citas no son 100% exactas.