Template:Rigby1986
Rigby, J. K. (1986). “Sponges of the Burgess shale (Middle Cambrian), British Columbia”. Palaeontographica Canadia (2).
Rigby, J. K. (1986). “Sponges of the Burgess shale (Middle Cambrian), British Columbia”. Palaeontographica Canadia (2).