APA引文

Hellwig, G. (1964). Differential operators of mathematical physics. Addison – Wesley.

Chicago Edition Citation

Hellwig, Gunter. Differential Operators of Mathematical Physics. Addison – Wesley, 1964.

MLA引文

Hellwig, Gunter. Differential Operators of Mathematical Physics. Addison – Wesley, 1964.

警告：這些引文格式不一定是100％准確.