APA (7th ed.) Citation
Foster Garth Nicholas & Friday Laurie. (2011). Keys to adults of the water beetles of Britain and Ireland (Part 1): (Coleoptera: Hydradephaga: Gyrinidae, Haliplidae, Paelobiidae, Noteridae and Dytiscidae) (2nd.). Royal Entomological Society.
Chicago Style (17th ed.) Citation
Foster Garth Nicholas and Friday Laurie. Keys to Adults of the Water Beetles of Britain and Ireland (Part 1): (Coleoptera: Hydradephaga: Gyrinidae, Haliplidae, Paelobiidae, Noteridae and Dytiscidae). 2nd. Royal Entomological Society, 2011.
MLA (9th ed.) Citation
Foster Garth Nicholas and Friday Laurie. Keys to Adults of the Water Beetles of Britain and Ireland (Part 1): (Coleoptera: Hydradephaga: Gyrinidae, Haliplidae, Paelobiidae, Noteridae and Dytiscidae). 2nd. Royal Entomological Society, 2011.
Warning: These citations may not always be 100% accurate.