Tomas, C. R., Hasle, G. R., SYVERTSEN,Erik E, STEIDINGER,Karen A, TANGEN,Karl, THRONDSEN,Jahn, & HEIMDAL, B. (1997). Identifying marine phytoplankton. Academic Press.

Tomas, Carmelo R., Grethe R. Hasle, SYVERTSEN,Erik E, STEIDINGER,Karen A, TANGEN,Karl, THRONDSEN,Jahn, and Berit,R HEIMDAL. Identifying Marine Phytoplankton. San Diego: Academic Press, 1997.

Tomas, Carmelo R., et al. Identifying Marine Phytoplankton. Academic Press, 1997.