APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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