Gaya APA

Spelling by principles. (1971). tempaterbit: penerbit.

Gaya Chicago

Spelling by principles. Edisi. tempaterbit: penerbit, 1971. Text.

Gaya MLA

Spelling by principles. Edisi. tempaterbit: penerbit, 1971. Text.

Gaya Turabian

Spelling by principles. tempaterbit: penerbit, 1971. Print.