APA

Hansen J., Alessandri P. T., Croft M. L., Burton P. R. & de Klerk N. H. (20040727). The Western Australian Register of Childhood Multiples: effects of questionnaire design and follow-up protocol on response rates and representativeness. : Twin research : the official journal of the International Society for Twin Studies.

Chicago

Hansen Janice, Alessandri Phyllis T, Croft Maxine L, Burton Paul R and de Klerk Nicholas H. 20040727. The Western Australian Register of Childhood Multiples: effects of questionnaire design and follow-up protocol on response rates and representativeness. : Twin research : the official journal of the International Society for Twin Studies.

Harvard

Hansen J., Alessandri P. T., Croft M. L., Burton P. R. and de Klerk N. H. (20040727). The Western Australian Register of Childhood Multiples: effects of questionnaire design and follow-up protocol on response rates and representativeness. : Twin research : the official journal of the International Society for Twin Studies.

MLA

Hansen Janice, Alessandri Phyllis T, Croft Maxine L, Burton Paul R and de Klerk Nicholas H. The Western Australian Register of Childhood Multiples: effects of questionnaire design and follow-up protocol on response rates and representativeness. : Twin research : the official journal of the International Society for Twin Studies. 20040727.