Cita APA (7th ed.)

Crewe, P., Gratwick, R., & Grafen, A. (2017). Defining fitness in an uncertain world. Springer Berlin Heidelberg.

Cita Chicago (17th ed.)

Crewe, P., R. Gratwick, i A. Grafen. Defining Fitness in an Uncertain World. Springer Berlin Heidelberg, 2017.

Cita MLA (9th ed.)

Crewe, P., et al. Defining Fitness in an Uncertain World. Springer Berlin Heidelberg, 2017.