(1977). Yearbook of mining, non-ferrous metals, and products statistics. Tokyo.
शिकागो स्टाइल उद्धरणYearbook of Mining, Non-ferrous Metals, and Products Statistics. Tokyo, 1977.
एमएलए उद्धरणYearbook of Mining, Non-ferrous Metals, and Products Statistics. Tokyo, 1977.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.