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- Key of eggs of Harpactorinae Amyot et Serville (Heteroptera, Reduviidae) of the European part of USSR
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- Key to the larvae of British Corixidae: 1-56
- McAtee, W.L. 1919b
- Key to the nearctic genera and species of Berytidae (Heteroptera)
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- Key to the nearctic species of Piesmidae (Heteroptera)
- Polivanova, E.N. 1964
- Key to the phytophagous pentatomid larvae (Hemiptera, Pentatomoidea) of Armenia
- China, W.E. 1940
- Key to the subfamilies and genera of Chinese Reduviidae with descriptions of new genera and species
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- Key to the subfamilies and tribes of the New World Coreidae (Hemiptera), with a checklist of published keys to genera and species
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- Key to the subfamilies of Naucoridae with a generic synopsis of the new subfamily Ambrysinae (Hemiptera)
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- Kanyukova, E.V. 1990
- Keys to aquatic and semiaquatic bugs (Heteroptera) of the Mongolian People's Republic
- Štys, P. 2002a
- Keys to genus-group taxa of the extant Enicocephalomorpha of the World, their list, and taxonomic changes (Heteroptera)
- Hungerford, H.B. & R. Matsuda 1960a
- Keys to subfamilies, tribes, genera and subgenera of the Gerridae of the World
- Vásárhelyi, T. 1985
- Keys to the fifth instar larvae of flat bugs of the Carpathian Basin (Heteroptera: Aradidae)
- Carvalho, J.C.M. 1955a
- Keys to the genera of the Miridae of the world (Hemiptera)
- Mohammed, S.K., H.H. Fadl & S.M. Gadalla 1998a
- Keys to the species of subfamily Geocorinae (Lygaeidae, Heteroptera) in Egypt
- Kothe, T. & K. Schönitzer 2004
- Klärung des Typenverbleibes von Orthotylus (Melanotrichus) korbanus Wagner, 1977 und Tuponia (Chlorotuponia) kebillina Wagner, 1977
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- Kleine heteropterologische Mitteilungen
- Mink, W. 1859
- Kleinere Mitteilungen
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- Schrank, F. von P. 1782
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- Roubal, J. 1959b
- Kritisches über die Taxonomie und Variabilität des Pachybrachius fracticollis (Schill.) 1829 (Hemiptera-Heteroptera)
- Billen, W. 2004
- Kurzbericht über das Auftreten einer neuen Wanze in Deutschland
- Karsch, F. 1892
- Kurze Charakteristik neuer Wanzen aus Kamerun, gesammelt durch Herrn Dr. Paul Preuss
- Herbst, J.F.W. 1784
- Kurze Einleitung zur Kenntniss der Insekten, für Ungeübte und Anfänger