H.N. Werkman.

MLA

Purvis, Alston W. H.n. Werkman. London: Laurence King Publishing, 2004.

APA

Purvis, A. W. (2004). H.N. Werkman. London: Laurence King Publishing.

Chicago

Purvis, Alston W. H.N. Werkman. London: Laurence King Publishing, 2004.