Category:German baroque lutes
- Robert Spencer. Chitarrone, Theorbo and Archlute. Part 4: Postscript: lutes with two heads — Two-headed lute, German baroque lute (? or theorbo),. VanedWards.co.uk.; reproduced from the original article:
Robert Spencer (1976). "Chitarrone, Theorbo and Archlute". Early Music 4 (4): 408–422. Oxford University Press.