Gaya APA
Philip, G., Joseph, H. (1994).
Principles of geometry / Philip Griffiths, Joseph Harris .
New York:
John Wiley n Sons.
Gaya MLA
Griffiths, Philip., Harris, Joseph.
"Principles of geometry / Philip Griffiths, Joseph Harris".
New York:
John Wiley n Sons,
1994.
Textbook.