Cita APA (7th ed.)

DIXON, F. (1970). THE HARDY BOYS: THE SHATTERED HELMET. GROSSET & DUNLAP.

Cita Chicago (17th ed.)

DIXON, FRANKLIN.W. THE HARDY BOYS: THE SHATTERED HELMET. USA: GROSSET & DUNLAP, 1970.

Cita MLA (9th ed.)

DIXON, FRANKLIN.W. THE HARDY BOYS: THE SHATTERED HELMET. GROSSET & DUNLAP, 1970.