MathWorld - Block Design
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Wolfram MathWorld reference entry defining block designs as incidence systems with parameters (v, b, r, k, λ), giving the relations between those parameters, standard examples, and links to related designs. Useful for checking definitions and notation while studying design theory.
More resources on Combinatorial Designs
Wolfram MathWorld
MathWorld is an online mathematics encyclopedia from Wolfram Research offering detailed, browsable articles on topics across the math spectrum, including algebra, geometry, calculus, and number theory. Each entry includes definitions, theorems, formulas, diagrams, worked examples, and links to further reading.
HandWiki - Combinatorial Design
Comprehensive overview of combinatorial designs
Combinatorial Designs: Constructions and Analysis
Upper-undergraduate and graduate text on the construction and analysis of combinatorial designs: balanced incomplete block designs, difference sets, symmetric designs, Latin squares, Hadamard matrices, resolvable designs, and t-designs, with applications to codes and cryptography. Readers learn standard construction techniques and existence results.