University Press. 1990. Comrie, Bernard. Language universals and linguistic typology: Syntax and morphology. 2nd. Oxford: Blackwell. 1989. ISBN 0-226-11433-3
including a range of hippocampi, are set in cultural context and ordered by typology in Monika Boosen, Etruskische Meeresmischwesen: Untersuchungen zur Typologie