APA引文

Hawking,Stephen, & Penrose,Roger. (1999). The Nature of Space and Time. OUP.

Chicago Edition Citation

Hawking,Stephen, and Penrose,Roger. The Nature of Space and Time. Delhi: OUP, 1999.

MLA引文

Hawking,Stephen, and Penrose,Roger. The Nature of Space and Time. OUP, 1999.

警告：这些引文格式不一定是100％准确.