Gaya APA

Alexander, L.G.. ([s.a.]). Practice and Progress . [s.l.]: [s.n.].

Gaya Chicago

Alexander, L.G.. Practice and Progress. [s.l.]: [s.n.], [s.a.]. Text.

Gaya MLA

Alexander, L.G.. Practice and Progress. [s.l.]: [s.n.], [s.a.]. Text.

Gaya Turabian

Alexander, L.G.. Practice and Progress. [s.l.]: [s.n.], [s.a.]. Print.