Types of Quantitative Research Designs:
Quantitative research designs – Iowa Research Online. Journal article: An overview of research designs relevant to nursing: part 1: quantitative research designs. Valmi D. Sousa University of North Carolina at Charlotte Martha Driessnack University of Iowa Isabel Amélia Costa Mendes University of São Paulo at Ribeirão Preto.
Internal and external validity: can you apply research study results to your patients? Cecilia Maria Patino 1 , 2 and Juliana Carvalho Ferreira.J Bras Pneumol. 2018 May-Jun; 44(3): 183. Alternate link.
