 Srivastava et al. (2009) performed a study in  which the effectiveness of students' use of expressive suppression was analyzed in the transition period between high school and college.
<coherence>  Srivastava et al. (2009) performed a study in  which the effectiveness of students' use of expressive suppression was analyzed in the transition period between high school and college.
 Srivastava et al. (2009) performed a study in 2009 in which the effectiveness of students' use of expressive suppression was analyzed in the transition period between high school and college.