APA (7th ed.) Citation

Hentschel, K. (2002). Spectroscopy or spectroscopies?

Chicago Style (17th ed.) Citation

Hentschel, Klaus. Spectroscopy or Spectroscopies? 2002.

MLA (9th ed.) Citation

Hentschel, Klaus. Spectroscopy or Spectroscopies? 2002.

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