Gaya APA

SPADA, N., FROHLICH, M. (1995). COLT observation scheme : coding conventions & applications . Sydney: National Centre for English Teaching and Research (NCETR).

Gaya MLA

SPADA, Nina., FROHLICH, Maria. "COLT observation scheme : coding conventions & applications". Sydney: National Centre for English Teaching and Research (NCETR), 1995. Buku.