(1970). Serpentina. Santillana.
Tohutoru Kātū Chicago (17th ed.)Serpentina. Madrid: Santillana, 1970.
Tohutoro MLA (9th ed.)Serpentina. Santillana, 1970.
Kia tūpato: Kāore pea ēnei kupu hautoa i te ōrite pū 100%.
Tohutoro APA (7th ed.)