G* power is a free statistical software that allows the user to determine the sample size needed based on a wide variety of tests.
G*Power: Calculating Sample Size in a T-Test
Determining Sample Size in General Linear Models
G*Power Sample Size Calculations: 5 Min Demo
Sample Size In Logistic Regression: Calculating Correctly!
Determining Sample Size in Experimental Studies
Multiple Regression Power Analysis
Calculating Sample Size: Cohen's Tables and G. Power - ppt download
Sample size formula for the comparison of two independent means
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Power Analysis: Determining Sample Size for Quantitative Studies
Sample size calculation using G*Power 3.1.5.
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Calculating Sample Size: Cohen's Tables and G. Power - ppt download
Using GPower for Sample Size and Power
Power (Statistics) - The Ultimate Beginners Guide