Cita APA (7th ed.)

Brewster, S., Davies, P., & Rogers, M. (2002). Skyline 4: Student's book. MacMillan.

Cita Chicago (17th ed.)

Brewster, Simon, Paul Davies, i Mickey Rogers. Skyline 4: Student's Book. Oxford: MacMillan, 2002.

Cita MLA (9th ed.)

Brewster, Simon, et al. Skyline 4: Student's Book. MacMillan, 2002.