- Baker, P. S., J. F. Barrera, and J. E. Valenzuela. 1989. The distribution of the coffee berry borer Hypothenemus hampei in southern Mexico: a survey for a biocontrol project . Tropical Pest Management 35:163-168.
- Barrera, J., P. Baker, J. Valenzuela, and A. Schwarz. 1990a. Introducción de dos especies de parasitoides Africanos a México para el control biológico de la Broca del Café, Hypothenemus hampei (Ferrari) (Coleoptera: Scolytidae) [Introduction of two species of African parasitoids to Mexico for biological control of the coffee berry borer Hypothenemus hampei (Ferrari) (Coleoptera: Scolytidae)]. Folia Entomológica Mexicana 79:245-247.