Metal Archives (Encyclopaedia Metallum) Hits 100,000 Bands! : r/Metal

The Fist in the Face of God”: Heavy Metal Music and Decentralized Cultural Diffusion - Adam Mayer, Jeffrey M. Timberlake, 2014

The Black Market: The Month In Metal – March 2017

Encyclopaedia Metallum: The Metal Archives

Encyclopaedia Metallum: The Metal Archives

What are the best Scandinavian/Nordic metal bands? - Quora

Metal Statistics – Statistical analytics about metal bands.

Metal Bands in Europe : r/europe

Number of metal bands in and location quotients of Finnish

metalstats – Metal Statistics