Gaya APA

Sommerfeld, R, M. et al (1981). An Introduction To Taxation (Ed. 1982). Amerika Serikat: Harcourt Brace Jovanovich.

Gaya MLA

Sommerfeld, Ray, M.. et al. "An Introduction To Taxation". Ed. 1982 Amerika Serikat: Harcourt Brace Jovanovich, 1981. Text.