APA引文

ASHKAN, K., & CASEY, A. T. (1999). Christmas tree sign. BMJ Group.

Citação norma Chicago

ASHKAN, K., and A. T. CASEY. Christmas Tree Sign. BMJ Group, 1999.

MLA引文

ASHKAN, K., and A. T. CASEY. Christmas Tree Sign. BMJ Group, 1999.

警告：這些引文格式不一定是100％准確.