APA   Click to copy
Moilanen, K. L., & Manuel, M. L. (2018). Sexual behavior. In M. H. Bornstein (Ed.), The Sage Encyclopedia of Lifespan Human Development. Sage.

Chicago/Turabian   Click to copy
Moilanen, Kristin L., and M. L. Manuel. “Sexual Behavior.” In The Sage Encyclopedia of Lifespan Human Development, edited by M. H. Bornstein. Sage, 2018.

MLA   Click to copy
Moilanen, Kristin L., and M. L. Manuel. “Sexual Behavior.” The Sage Encyclopedia of Lifespan Human Development, edited by M. H. Bornstein, Sage, 2018.

@inbook{kristin2018a,
  title = {Sexual behavior},
  year = {2018},
  publisher = {Sage},
  author = {Moilanen, Kristin L. and Manuel, M. L.},
  editor = {Bornstein, M. H.},
  booktitle = {The Sage Encyclopedia of Lifespan Human Development}
}