Massar, K., A. P. Buunk, and S. L. K. Gruijters. “Pregnant Women’s View on Their Relationship: A Comparison With Nonpregnant Women”. Interpersona: An International Journal on Personal Relationships, Vol. 7, no. 2, Dec. 2013, pp. 272–281, doi:10.5964/ijpr.v7i2.122.