Cita APA (7a ed.)

Ruby, I., Ruby, A., & Janson, N. (2014). The economy of sustainable construction. Ruby Press.

Cita Chicago Style (17a ed.)

Ruby, Ilka, Andreas Ruby, y Nathalie Janson. The Economy of Sustainable Construction. Berlin: Ruby Press, 2014.

Cita MLA (9a ed.)

Ruby, Ilka, et al. The Economy of Sustainable Construction. Ruby Press, 2014.