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Old (some outdated names) but comprehensive for all Empididae s.l.:
Collin, J.E., 1961. Empididae. - British Flies 6: v-viii, 1-782.

More up to date for Hybotidae:
Chv?la, M., 1975. The Empidoidea (Diptera) of Fennoscandia and Denmark. - Fauna Entomologica Scandinavica 3: 1-336.
Chv?la, M., 1983. The Empidoidea (Diptera) of Fennoscandia and Denmark II. General part. The families Hybotidae, Atelestidae and Microphoridae. - Fauna Entomologica Scandinavica 12: 1-279.

General subdivision within Empididae s.str.:
Chv?la, M., 1994. The Empidoidea (Diptera) of Fennoscandia and Denmark. III. Genus Empis. - Fauna Entomologica Scandinavica 29: 1-192.