Hayashi, C; Mikami, H; Nishihara, R; Maeda, C; Hayakawa, K (2014). "The relationship between twin language, twins' close ties, and social competence". Twin Research and Human Genetics. 17 (1): 27–37. doi:10.1017/thg.2013.83. PMID24330841. S2CID31514697.
Hayashi, C; Mikami, H; Nishihara, R; Maeda, C; Hayakawa, K (2014). "The relationship between twin language, twins' close ties, and social competence". Twin Research and Human Genetics. 17 (1): 27–37. doi:10.1017/thg.2013.83. PMID24330841. S2CID31514697.
Hayashi, C; Mikami, H; Nishihara, R; Maeda, C; Hayakawa, K (2014). "The relationship between twin language, twins' close ties, and social competence". Twin Research and Human Genetics. 17 (1): 27–37. doi:10.1017/thg.2013.83. PMID24330841. S2CID31514697.