Pérez, A.E. 2007. Caracterización y evaluación del pigmento antociánico de la cascara de oca morada (Oxalis tuberosa Mol.). Bachelor's thesis, Universidad Nacional Agraria La Molina.
Ibraimo, N.A. 2005. Water management strategies under sufficiency and insufficiency water conditions for tomato and round cabbage production in the Chókwè Irrigation Scheme. Thesis (BSc). Maputo, Mozambique: Eduardo Mondlane University.