Obeng, Letitia (2016) [1967]. "Life-history and population studies on the Simuliidae of North Wales". Annals of Tropical Medicine & Parasitology. 61 (4): 472–487. doi:10.1080/00034983.1967.11686517. PMID5634138.
Obeng, Letitia (1965). "The identification of the aquatic stages of the British Simuliidae". Annals of Tropical Medicine & Parasitology. 59 (2): 240–254. doi:10.1080/00034983.1965.11686306. PMID14345291.
Obeng, Letitia (2016) [1967]. "Life-history and population studies on the Simuliidae of North Wales". Annals of Tropical Medicine & Parasitology. 61 (4): 472–487. doi:10.1080/00034983.1967.11686517. PMID5634138.
Obeng, Letitia (1965). "The identification of the aquatic stages of the British Simuliidae". Annals of Tropical Medicine & Parasitology. 59 (2): 240–254. doi:10.1080/00034983.1965.11686306. PMID14345291.