# The Door into Summer

> 1957 novel by Robert A. Heinlein

**Wikidata**: [Q427331](https://www.wikidata.org/wiki/Q427331)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/The_Door_into_Summer)  
**Source**: https://4ort.xyz/entity/the-door-into-summer


## References

1. Internet Speculative Fiction Database
2. Freebase Data Dumps. 2013
3. [Source](https://archive.org/details/doorintosummer00robe_0)
4. [Source](https://golden.com/wiki/The_Door_into_Summer-K3VYX)
5. Goodreads