Gaya APA

Preface to the Seond Edition. (1971). : .

Gaya Chicago

Preface to the Seond Edition. 2. : , 1971. Text.

Gaya MLA

Preface to the Seond Edition. 2. : , 1971. Text.

Gaya Turabian

Preface to the Seond Edition. : , 1971. Print.