Παραπομπή APA

Willaims, H. (1954). Petrography: An introduction to the study of rock in thin sections. VFS.

Παραπομπή Chicago Style

Willaims, Howel. Petrography: An Introduction to the Study of Rock in Thin Sections. Bombay: VFS, 1954.

Παραπομπή MLA

Willaims, Howel. Petrography: An Introduction to the Study of Rock in Thin Sections. VFS, 1954.