참조

• Sound

Robot City - https://www.youtube.com/audiolibrary/music

mechanical.flac by Halleck - https://freesound.org/people/Halleck/sounds/19336/

• Image

OpenClipart-Vectors / 사진 27427 - https://pixabay.com/images/id-152501/

Seanbatty / 사진 1 - https://pixabay.com/images/id-2228610/

OpenClipart-Vectors / 사진 27427 - https://pixabay.com/images/id-1299830/

• Video

Vimeo-Free-Videos / 435 개의 동영상 - https://pixabay.com/videos/id-4764/