APA (7th ed.) Citation

Graham, C. (2019). 21st century skills in ELT. Modern English Teacher, 28(3), 11.

Chicago Style (17th ed.) Citation

Graham, Christopher. "21st Century Skills in ELT." Modern English Teacher 28, no. 3 (2019): 11.

MLA (9th ed.) Citation

Graham, Christopher. "21st Century Skills in ELT." Modern English Teacher, vol. 28, no. 3, 2019, p. 11.