1. Baker, J.M., Clark, R.B., Kingston, P.F., 1990. Environmental recovery in Prince William Sound and the Gulf of Alaska. Field Observations. Heriot-Watt University, Edinburgh, Scotland, UK
2. Polychaeta, with Keys to the British Genera;Clark,1960
3. Dynamics in Metazoan Evolution: the Origin of the Coelom and Segments;Clark,1964
4. Zoology: the Study of Animals;Clark,1966
5. Annelida, Echiura, and Sipuncula;Clark,1969