“…To capture references that described each approach, we also searched the above L2 terms in combination with general terms relating to our four perspectives, such as child language, sociocultural , and psycholinguistic . We also used the following literature reviews on related topics to locate empirical studies that met our inclusion criteria: August and Shanahan (2006), Bialystok (1997), Birdsong (2006), Genesee, Lindholm-Leary, Saunders, and Christian (2006), Goldenberg and Coleman (2010), Hammer, Jia, and Uchikoshi (2011), Hyltenstam and Abrahamsson (2000), Liddicoat (2006), Lightbown (2000), Long (2005), Marinova-Todd, Marshall, and Snow (2000), Masgoret and Gardner (2003), Menken (2009), Muñoz (2008a, 2008b), Muñoz and Singleton (2011), Nikolov and Mihaljević Djigunović (2006), Rothman (2008), Saunders and Goldenberg (2010), Scovel (2000), Singleton (2005), Slabakova (2006), Snow and Kang (2006), Stevens (2006), and Ushioda (2010). Because the listed reviews frequently included studies from a general educational psychology perspective, we refer the reader to them for an additional perspective regarding our questions.…”