APA (7th ed.) Citation

Dahl, T. E. (1993). Hallo ?!: Norges telefonhistorie. Gyldendal.

Chicago Style (17th ed.) Citation

Dahl, Tor Edvin. Hallo ?!: Norges Telefonhistorie. [Oslo]: Gyldendal, 1993.

MLA (9th ed.) Citation

Dahl, Tor Edvin. Hallo ?!: Norges Telefonhistorie. Gyldendal, 1993.

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