- $5.59Ethnostatistics : Qualitative Foundations for Quantitative Research by Robert P., Jr. GEPHARTBetter World Books
- $39.00Archival and Secondary Data (The SAGE Quantitative Research Kit)Amazon
- $24.99Questionnaire validation for quantitative researchersUdemy
- $39.00Experimental Designs (The SAGE Quantitative Research Kit)Amazon