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Heiligmann, Randall B; Winch, Fred E. Chapter 3: The Maple Resource. Koelling, Melvin R; Heiligmann, Randall B (编). North American Maple Syrup Producers Manual. Bulletin 856. Ohio State University. 1996 [20 September 2010]. (原始内容存档于2006年4月29日).
Koelling, Melvin R; et al. Chapter 8: Syrup Filtration, Grading, Packing, and Handling. Koelling, Melvin R; Heiligmann, Randall B (编). North American Maple Syrup Producers Manual. Bulletin 856. Ohio State University. 1996 [20 September 2010]. (原始内容存档于2006年4月29日).引文使用过时参数coauthor (帮助)