APA (7th ed.) Citation

Oyama, M., & Takehara, H. Revised standard soil color charts.

Chicago Style (17th ed.) Citation

Oyama, Masatada, and Hideo Takehara. Revised Standard Soil Color Charts.

MLA (8th ed.) Citation

Oyama, Masatada, and Hideo Takehara. Revised Standard Soil Color Charts.

Warning: These citations may not always be 100% accurate.