Introducing User Needs Gathering to Product Development: Increasing Innovation and Customer Satisfaction. - Sari Kujala; Marjo Kauppinen; Sanna Rekola (INTERACT, 2001)

Field Studies in Practice: Making it Happen. - Sari Kujala; Marjo Kauppinen; Pia Nakari; Sanna Rekola (INTERACT, 2003)