HASIBUAN, H. S. R. (1987). ELT English for specific purposes: Law. Gramedia.
芝加哥风格引文HASIBUAN, H. Sofia R. ELT English for Specific Purposes: Law. Jakarta: Gramedia, 1987.
MLA引文HASIBUAN, H. Sofia R. ELT English for Specific Purposes: Law. Gramedia, 1987.
警告：这些引文格式不一定是100％准确.