Bartholomew. (2013). Unobserved Variables (1.). Springer Berlin Heidelberg.
Cita Chicago (17th ed.)Bartholomew. Unobserved Variables. 1. Springer Berlin Heidelberg, 2013.
Cita MLA (8th ed.)Bartholomew. Unobserved Variables. 1. Springer Berlin Heidelberg, 2013.
Atenció: Aquestes cites poden no estar 100% correctes.