Rural N(SO) and German middle-class mothers' interaction with their 3- and 6-month-old infants: A longitudinal cross-cultural analysis
Journal of Family Psychology (2015) - Comment
pubmed: 26075741  doi: 10.1037/fam0000100  issn: 1939-1293  issn: 0893-3200 

Bettina Lamm, Helene Gudi, Ina Fassbender, Claudia Freitag, Frauke Graf, Claudia Goertz, Sibylle Spangler, Manuel Teubert, Monika Knopf, Arnold Lohaus, Gudrun Schwarzer, Heidi Keller