Hartley, B. 1., Hawkes, T., Hawkes, T. O., Hawkes, T. O., & Hawkes, T. O. (1970). Rings, modules and linear algebra: A further course in algebra describing the structure of Abelian groups and canonical forms of matrices through the study of rings and modules. London: Chapman & Hall.

Hartley, B. 1939-, Trevor Hawkes, T. O. Hawkes, Trevor O. Hawkes, and Trevor O. Hawkes. Rings, Modules and Linear Algebra: A Further Course in Algebra Describing the Structure of Abelian Groups and Canonical Forms of Matrices Through the Study of Rings and Modules. London: Chapman & Hall, 1970.

Hartley, B. 1939-, et al. Rings, Modules and Linear Algebra: A Further Course in Algebra Describing the Structure of Abelian Groups and Canonical Forms of Matrices Through the Study of Rings and Modules. London: Chapman & Hall, 1970.