APA (7th ed.) Citation

Heinlein, R. A. (1985). The door into summer: [a science fiction novel] (4. impr.). Gollancz.

Chicago Style (17th ed.) Citation

Heinlein, Robert A. The Door into Summer: [a Science Fiction Novel]. 4. impr. London: Gollancz, 1985.

MLA (9th ed.) Citation

Heinlein, Robert A. The Door into Summer: [a Science Fiction Novel]. 4. impr. Gollancz, 1985.

Warning: These citations may not always be 100% accurate.