 | Newman, H.H., Freeman, F.N., Holzinger, K.J.,
Twins: A Study of Heredity and Environment
, Chicago, University of Chicago Press, 1966
|
| Newton, W., Keith, L., Keith, D., "The Northwestern University Multihospital Twin Study: IV. Duration of gestation according to fetal sex,"
American Journal of Obstetrics and Gynecology
, 1984, 149:6:6558
|
| Noble, E.,
Having Twins
, Boston, Houghton Mifflin, 1990
|
| Onstad, S., Skre, I., Edvardsen, J., Torgersen, S., Kringlen, E., "Mental disorders in first-degree relatives of schizophrenics,"
Acta Psychiatr. Scand
., 1991, 83:395401
|
| Onstad, S., Skre, I., Torgersen, S., Kringlen, E., "Twin concordance for DSM-III-R schizophrenia,"
Acta Psychiatr. Scand
., 1991, 83:4637
|
| Pakstis, A., Polesky, H., Scarr, S., Katz, S., "Gene frequency estimates for samples of black and white twins from the Philadelphia metropolitan area,"
Human Genetics
, 1978, 43:15977
|
| Pearlman, E.M., "Separation-individuation, self-concept, and object relations in fraternal twins, identical twins, and singletons,"
Journal of Psychology
, 1990, 124:6:61928
|
| Pedersen, N.L., Gatz, M., Plomin, R., et al., "Individual differences in locus of control during the second half of the life span for identical and fraternal twins reared apart and reared together,"
Journal of Gerontology
, 1989, 44:4:1005
|
| Pedersen, N.L., Lichtenstein, P., Plomin, R., DeFaire, U., McClearn, G.E., Matthews, K.A., "Genetic and environmental influences for type-A-like measures and related traits: a study of twins reared apart and twins reared together,"
Psychosomatic Medicine
, 1990, 51:138:42840
|
| Pedersen, N.L., Plomin, R., McClearn, G.E., Friberg, L., "Neuroticism, extraversion, and related traits in adult twins reared apart and reared together,"
Journal of Personality and Social Psychology
, 1988, 55:6:9507
|
|
