APA

Helmholz R. H., . (2001). The ius commune in England. Oxford: Oxford University Press.

Chicago

Helmholz R H, . 2001. The ius commune in England. Oxford: Oxford University Press.

Harvard

Helmholz R. H., . (2001). The ius commune in England. Oxford: Oxford University Press.

MLA

Helmholz R H, . The ius commune in England. Oxford: Oxford University Press. 2001.