APA (7e ed.) Bronvermelding

Butterfield, J. (2018). Soft Skills for Everyone. Cengage Learning.

Chicago (17e ed.) Bronvermelding

Butterfield, Jeff. Soft Skills for Everyone. Delhi: Cengage Learning, 2018.

MLA (9e ed.) Bronvermelding

Butterfield, Jeff. Soft Skills for Everyone. Cengage Learning, 2018.