APA (7th ed.) Citation

Butler, C. (1999). A Course in Advance Thinking for Sixth Formers. Gifted Education International, 14(1), 22.

Chicago Style (17th ed.) Citation

Butler, Colin. "A Course in Advance Thinking for Sixth Formers." Gifted Education International 14, no. 1 (1999): 22.

MLA (9th ed.) Citation

Butler, Colin. "A Course in Advance Thinking for Sixth Formers." Gifted Education International, vol. 14, no. 1, 1999, p. 22.