Walter F. Quezada Moreno, Marcia Proaño Molina, Edwin Cevallos Carvajal, Elsa Quilumbaquin Toaquiza, Josue Israel Sopalo Romero, and Walter D. Quezada Torres, “Tagetes pusilla Kunth Essential Oil: Color and Composition in a Fresh and Stored Sample”, NACB-V6, pp. 149–166, Aug. 2023.