 According to Gross  Levenson's ( 1993 ) Gross, J. J., & Levenson, R. W. (1993).
<clarity>  According to Gross  Levenson's ( 1993 ) Gross, J. J., & Levenson, R. W. (1993).
 According to Gross and Levenson's ( 1993 ) Gross, J. J., & Levenson, R. W. (1993).